Re: [darktable-user] open CL 2.0.6

[Ulrich Pegelow]

Well, in your case I see the differences as only marginal - the time 
spent in the OpenCL pixelpipe differs only by 2% between the two setting 
(in favor of TRUE). Not sure if differences persist if you would repeat 
profiling several times to get out any fluctuations.


So it seems that your combination of GPU and driver does not profit from 
the opencl_use_pinned_memory flag. But in your case it would not harm 
either to change the default to TRUE.


To others: I am interested to see if there are systems where 
opencl_use_pinned_memory=TRUE gives a heavy negative impact on performance.


Ulrich

Am 15.09.2016 um 06:00 schrieb Jack Bowling:

On 09/14/2016 09:56 AM, Ulrich Pegelow wrote:

Well, there obviously is an issue with OpenCL and NVIDIA. However, a
quick check reveals that this is not related to 2.0.6 versus 2.0.5.

In fact it seems that NVIDIA did some changes to their drivers in the
way they handle memory transfers over the IDE interface.

There is a quick fix for that in darktable. You can switch config
variable opencl_use_pinned_memory to TRUE (can be found in darktablerc).
At least here on my this makes a difference of up to a factor of 30
(oldish GeForce GTS 450 and 367.35 driver).



Setting pinned_memory=true leads to slower render times on my box. Here
is system info on my fully updated Ubuntu 16.04 box:

$ darktable --version
this is darktable 2.0.6
copyright (c) 2009-2016 johannes hanika
darktable-...@lists.darktable.org

compile options:
  bit depth is 64 bit
  normal build
  OpenMP support enabled
  OpenCL support enabled
  Lua support enabled, API version 3.0.0
  Colord support enabled
  gPhoto2 support enabled
  GraphicsMagick support enabled

$ inxi
CPU~Octa core AMD FX-8300 Eight-Core (-MCP-) speed/max~1400/3300 MHz
Kernel~4.4.0-36-generic x86_64 Up~8 days Mem~2495.3/32090.4MB
HDD~23734.6GB(33.4% used) Procs~340 Client~Shell inxi~2.2.35

$ inxi -G
Graphics:  Card: NVIDIA GK107 [GeForce GT 740]
   Display Server: X.Org 1.18.3 drivers: nvidia (unloaded:
fbdev,vesa,nouveau)
   Resolution: 2560x1440@59.95hz
   GLX Renderer: GeForce GT 740/PCIe/SSE2
   GLX Version: 4.5.0 NVIDIA 361.42

Here is the relevant paste from my darktable config:

opencl=TRUE
opencl_async_pixelpipe=false
opencl_avoid_atomics=false
opencl_checksum=4188966525
opencl_device_priority=*/!0,*/*/*
opencl_library=
opencl_memory_headroom=1000
opencl_memory_requirement=768
opencl_micro_nap=1000
opencl_number_event_handles=25
opencl_omit_whitebalance=
opencl_size_roundup=16
opencl_synch_cache=false
opencl_use_cpu_devices=false
opencl_use_pinned_memory=false

Note the high headroom necessary to prevent atrous dumping to CPU.

Attached are two text files of "darktable -d opencl -d perf" output, one
with pinned_memory=true and one with pinned_memory=false.

Jack




darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

Re: [darktable-user] open CL 2.0.6

[I. Ivanov]

Hi Ulrich,

Just want to say a big Thank You for "switch config variable 
opencl_use_pinned_memory to TRUE"


For me the speed improvement is very noticeable.

When set to "TRUE" - I am exporting the control image for 34s and worse 
is 39s
When set to "false" - I am exporting the same image for about 44s and 
worse is about 58s


The darktable area is way more responsive. Also I can see the processor 
have freed up quite a bit. If I do not use open CL it would hit 
consistently 100% on all cores - now it hovers around 75% on all cores.


I am very pleased with the results of the switch!

Thank you once again...

B


On 2016-09-14 10:43 AM, Ulrich Pegelow wrote:
The flag will mostly effect situations where tiling comes into play. 
That's the case for GPUs with low memory and for modules with high 
memory demand (e.g. equalizer).


Am 14.09.2016 um 19:39 schrieb Colin Adams:

Yes, it's working now. I guess the crash must have been a coincidence.
Slower if anything, but there isn't much in it. I can't be sure.
Running with NVIDIA 370.28 driver.



 


darktable user mailing list
to unsubscribe send a mail to 
darktable-user+unsubscr...@lists.darktable.org





darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

Re: [darktable-user]

[Kevin]

Got it! Finally. Never underestimate the stupidity of a simpleton. :(

On Thursday, 15 September 2016 1:09:54 AM AEST Roman Lebedev wrote:
> On Thu, Sep 15, 2016 at 1:05 AM, Kevin  wrote:
> > Hi Tobias,
> > 
> > Thanks for your help. My problem was that I expected the colour selected
> > within dt be the one in which the text was rendered. All OK now that I
> > have
> > changed the colour in the svg itself.
> > 
> > Which leaves the question: How is the colour you select within dt used?
> > 
> > Cheers,
> > Kev
> > 
> > On Wednesday, 14 September 2016 2:32:17 PM AEST Tobias Ellinghaus wrote:
> >> Am Mittwoch, 14. September 2016, 17:02:45 CEST schrieb kev:
> >> > Hi,
> >> 
> >> Hi.
> >> 
> >> > I'm having trouble with watermarks: How do you change the text colour?
> >> > 
> >> > Yes, I've selected a colour via the colour chooser but how to I apply
> >> > that
> >> > colour to the current image?
> 
> That only applies to the simple-text.svg watermark, because it uses that
> 
> variable ($(WATERMARK_COLOR)) as the color value, as houz explains:
> >> Is that with the simple-text example that comes with darktable or a
> >> custom
> >> one? In the first case it should just work. With a custom SVG file you
> >> would have to open the SVG in a text editor and replace the color
> >> strings for the text (something like "#00") with
> >> "$(WATERMARK_COLOR)".
> >> 
> >> If you can't get it to work you can send me the SVG and I will edit it
> >> for
> >> you. Or just look at the file "simple-text.svg" in your darktable
> >> installation by opening it in a text editor.
> >> 
> >> > Thanks in advance,
> >> > Kevin
> >> 
> >> Tobias
> 
> Roman.
> 
> > 
__
> > __ darktable user mailing list
> > to unsubscribe send a mail to
> > darktable-user+unsubscr...@lists.darktable.org
> 

> darktable user mailing list
> to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org



darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

Re: [darktable-user]

[Roman Lebedev]

On Thu, Sep 15, 2016 at 1:05 AM, Kevin  wrote:
> Hi Tobias,
>
> Thanks for your help. My problem was that I expected the colour selected
> within dt be the one in which the text was rendered. All OK now that I have
> changed the colour in the svg itself.
>
> Which leaves the question: How is the colour you select within dt used?
>
> Cheers,
> Kev
>
> On Wednesday, 14 September 2016 2:32:17 PM AEST Tobias Ellinghaus wrote:
>> Am Mittwoch, 14. September 2016, 17:02:45 CEST schrieb kev:
>> > Hi,
>>
>> Hi.
>>
>> > I'm having trouble with watermarks: How do you change the text colour?

>> > Yes, I've selected a colour via the colour chooser but how to I apply that
>> > colour to the current image?
That only applies to the simple-text.svg watermark, because it uses that
variable ($(WATERMARK_COLOR)) as the color value, as houz explains:

>> Is that with the simple-text example that comes with darktable or a custom
>> one? In the first case it should just work. With a custom SVG file you would
>> have to open the SVG in a text editor and replace the color strings for the
>> text (something like "#00") with "$(WATERMARK_COLOR)".
>>
>> If you can't get it to work you can send me the SVG and I will edit it for
>> you. Or just look at the file "simple-text.svg" in your darktable
>> installation by opening it in a text editor.
>>
>> > Thanks in advance,
>> > Kevin
>>
>> Tobias
Roman.

> 
> darktable user mailing list
> to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org
>

darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

Re: [darktable-user]

[Kevin]

Hi Tobias,

Thanks for your help. My problem was that I expected the colour selected 
within dt be the one in which the text was rendered. All OK now that I have 
changed the colour in the svg itself.

Which leaves the question: How is the colour you select within dt used?

Cheers,
Kev

On Wednesday, 14 September 2016 2:32:17 PM AEST Tobias Ellinghaus wrote:
> Am Mittwoch, 14. September 2016, 17:02:45 CEST schrieb kev:
> > Hi,
> 
> Hi.
> 
> > I'm having trouble with watermarks: How do you change the text colour?
> > 
> > Yes, I've selected a colour via the colour chooser but how to I apply that
> > colour to the current image?
> 
> Is that with the simple-text example that comes with darktable or a custom
> one? In the first case it should just work. With a custom SVG file you would
> have to open the SVG in a text editor and replace the color strings for the
> text (something like "#00") with "$(WATERMARK_COLOR)".
> 
> If you can't get it to work you can send me the SVG and I will edit it for
> you. Or just look at the file "simple-text.svg" in your darktable
> installation by opening it in a text editor.
> 
> > Thanks in advance,
> > Kevin
> 
> Tobias



darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

Re: [darktable-user] Making a local colour change?

[Matthieu Moy]

I'd try "color balance", using the "gain" sliders which affect essentially 
highlights.

Otherwise, try "color zones" to change the color, with a parametric mask to 
select only the highlights.

In any case, I think you'll need to reduce the exposure: if some color channels 
are clipped, no module can do the job as the result you'd expect is not 
representable in your colorspace.

- Original Message -
> To make it explicit, if it wasn't already clear - I know what it should
> look like - I just need to change the two areas (I can draw a mask) to that
> particular colour.
> I just don't know what module I can use to easily do that.
> I looked at the modules in the color section, and didn't see one I thought
> I knew how to use.
> 
> On Wed, 14 Sep 2016 at 17:50 Colin Adams  wrote:
> 
> > I don't think it does.
> > Color reconstruction module uses surrounding colour. That won't work here.
> >
> > On Wed, 14 Sep 2016 at 17:35 Ariel Kanterewicz  wrote:
> >
> >> You may want to look at this post from the blog:
> >> http://www.darktable.org/2015/03/color-reconstruction/
> >> It explains a solution for pretty much the same issue you have here.
> >>
> >> On Wed, Sep 14, 2016 at 4:54 AM Colin Adams 
> >> wrote:
> >>
> >>> I took this photo with flash:
> >>> https://www.dropbox.com/s/f6bmy554la7quho/132441800.jpg?dl=0
> >>>
> >>> and it is clearly overexposed in the foreground. Using the graduated
> >>> density module gives a very nice result, all except for the two large
> >>> yellow oval patches on the thorax - these should be a (yellowish) green.
> >>> The histogram for these areas shows that both the red and green channels
> >>> are blown out in these areas. But I guess I should be able to alter the
> >>> colour locally in some way (by reducing the red channel, and maybe some
> >>> of
> >>> the green). What's the best module to use to do this?
> >>>
> >>> 
> >>> darktable user mailing list to unsubscribe send a mail to
> >>> darktable-user+unsubscr...@lists.darktable.org
> >>>
> >>
> 
> 
> darktable user mailing list
> to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

-- 
Matthieu Moy
http://www-verimag.imag.fr/~moy/

darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

Re: [darktable-user] 360 degree panoramas

[Anton Aylward]

On 09/14/2016 07:08 AM, Michael wrote:
> Sorry about having a broad question but I am just starting out with this so I
> must start broad. And my broad question led to (what I suppose) are broad
> answers which is just what I need as a starting point.
> So, I suppose I will start with some specific questions:
> What equipment should I get?

Well, you might get a camera that does panoramas.
Most high end DSLRs and equivalent do; my <$100 shirt pocket P&S does.

However the linear output of their panoramic shots might look odd.
They are supposed to wrap around so thing that are linear in the real world look
curved when laid out flat.  For example, if you take a 180 degree shot of a
straight  low wall from about six feet away, its going to end up looing curved.
BTDT often with hilarious results :-)


One ABSOLUTE requirement you *** MUST *** get for panoramic shots is a tripod.
You need a stable platform.  A tripod with a tilt&rotate head is going to let
you rotate smoothly so it is is easier when you piece together you shots using
'hungin'.

> You say a fish eye lens. Other sites I've looked at in my research recommend 
> an
> 8mm. Is that good?

Irrelevant and distracting.

With the tripod and 'hugin' you can take good panoramas with a telephoto lens.
If you use a zoom make sure you don't 'zoom', stay at the same focal length.


-- 
In preparing for battle I have always found that plans are useless, but planning
is indispensable.
Dwight D. Eisenhower

darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

Re: [darktable-user] Darktable 2.0.6 dmg?

[Tobias Ellinghaus]

Am Mittwoch, 14. September 2016, 14:27:35 CEST schrieb Tobias Ellinghaus:
> Am Dienstag, 13. September 2016, 18:58:01 CEST schrieb J Albrecht:
> > Hello All,
> 
> Hi.
> 
> > I feel that I’m looking a gift horse into the mouth but, I’ll ask
> > nonetheless: Is a 2.0.6 dmg package available yet? I’ve looked but could
> > only find the 2.0.5 (which I’m already running on my MBPr)
> 
> Those are created by one person only and not by the darktable project as a
> whole. So all I can say that they will be available as soon as he gets
> around making them. Sorry for the non-answer, but that's all I can tell
> you. :-(

Actually I have some good news now: The 2.0.6 DMG got uploaded to the GitHub 
page and links on darktable.org got updated. Happy photo editing.

> Tobias



signature.asc
Description: This is a digitally signed message part.

Re: [darktable-user] Upgrading to GTK 3.20 ruins all menus (at least in darkroom)

[Jean-Luc Lacroix]

Hello Pascal and Roman,

The font hack did the trick. Will wait until 2.0.6 lands in the testing 
repo's to give it a try with the stock css file. Shouldn't be too long, 
the Debian testing maintainer is pretty fast to update the DT package in 
testing.


Thanks for your help.

Jean-Luc

On 14/09/16 20:37, Pascal Obry wrote:

Le mercredi 14 septembre 2016 à 20:21 +0200, Jean-Luc Lacroix a écrit :

Seems that I am also hit by the GTK problem. Here is my environment:

Distro: Debian testing
DT: 2.0.5
GTK: libgtk-3-0 version 3.21.5-3

I have tried the Pascal Obry's CSS to no avail. Any chance that the
DT
2.0.6 cured the problem?

Screenshot of what I see when I launch DT:

https://goo.gl/pLw6mx


This is a Gtk 3.21 issue not a 3.20 one :) Use my CSS for now and
replace the font to read:

 font: 8pt Sans;

Should be fixed in 2.0.6.

--
  Pascal Obry /  Magny Les Hameaux (78)

  The best way to travel is by means of imagination

  http://www.obry.net

  gpg --keyserver keys.gnupg.net --recv-key F949BD3B

darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org



darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

Re: [darktable-user] Upgrading to GTK 3.20 ruins all menus (at least in darkroom)

[Pascal Obry]

Le mercredi 14 septembre 2016 à 20:21 +0200, Jean-Luc Lacroix a écrit :
> Seems that I am also hit by the GTK problem. Here is my environment:
> 
> Distro: Debian testing
> DT: 2.0.5
> GTK: libgtk-3-0 version 3.21.5-3
> 
> I have tried the Pascal Obry's CSS to no avail. Any chance that the
> DT 
> 2.0.6 cured the problem?
> 
> Screenshot of what I see when I launch DT:
> 
> https://goo.gl/pLw6mx

This is a Gtk 3.21 issue not a 3.20 one :) Use my CSS for now and
replace the font to read:

 font: 8pt Sans;

Should be fixed in 2.0.6.

-- 
  Pascal Obry /  Magny Les Hameaux (78)

  The best way to travel is by means of imagination

  http://www.obry.net

  gpg --keyserver keys.gnupg.net --recv-key F949BD3B

darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

Re: [darktable-user] open CL 2.0.6

[Ulrich Pegelow]

The flag will mostly effect situations where tiling comes into play. 
That's the case for GPUs with low memory and for modules with high 
memory demand (e.g. equalizer).


Am 14.09.2016 um 19:39 schrieb Colin Adams:

Yes, it's working now. I guess the crash must have been a coincidence.
Slower if anything, but there isn't much in it. I can't be sure.
Running with NVIDIA 370.28 driver.




darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

Re: [darktable-user] Fwd: Bouncing messages from darktable-user@lists.darktable.org

[Patrick Shanahan]

* Niranjan Rao  [09-14-16 13:28]:
> I also got 2 messages. Gmail otherwise seems to be working ok.
> 
> On 09/14/2016 09:30 AM, Michael wrote:
> > I've received two of these messages today. Is something wrong?
> > 
> > -- Forwarded message --
> > From:  > >
> > Date: Wed, Sep 14, 2016 at 12:00 PM
> > Subject: Bouncing messages from darktable-user@lists.darktable.org
> > 
> > To: bmi...@gmail.com 
> > 
> > 
> > Hi, this is the Mlmmj program managing the
> >  > > mailing list.
> > 
> > Some messages to you could not be delivered. If you're seeing this
> > message it means things are back to normal, and it's merely for your
> > information.
> > 
> > Here is the list of the bounced messages:
> > - 1150

I am getting them, also.
-- 
(paka)Patrick Shanahan   Plainfield, Indiana, USA  @ptilopteri
http://en.opensuse.orgopenSUSE Community Memberfacebook/ptilopteri
http://wahoo.no-ip.orgPhoto Album: http://wahoo.no-ip.org/gallery2
Registered Linux User #207535@ http://linuxcounter.net

darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

Re: [darktable-user] open CL 2.0.6

[Colin Adams]

Yes, it's working now. I guess the crash must have been a coincidence.
Slower if anything, but there isn't much in it. I can't be sure.
Running with NVIDIA 370.28 driver.

On Wed, 14 Sep 2016 at 18:37 Ulrich Pegelow 
wrote:

> Do I understand correctly that you can run with the flag set to TRUE?
> What are your findings in terms of speed improvements (if any)?
>
> Am 14.09.2016 um 19:34 schrieb Colin Adams:
> > No.
> > Doesn't happen anymore.
> >
> > On Wed, 14 Sep 2016 at 18:26 Ulrich Pegelow  > > wrote:
> >
> > Any backtrace?
> >
> > Am 14.09.2016 um 19:12 schrieb Colin Adams:
> > > It causes darktable 2.0.5 (Fedora) to crash. Switching back to
> false
> > > cures the problem. So please don't change.
>
>
> 
> darktable user mailing list
> to unsubscribe send a mail to
> darktable-user+unsubscr...@lists.darktable.org
>
>


darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

Re: [darktable-user] open CL 2.0.6

[Ulrich Pegelow]

Do I understand correctly that you can run with the flag set to TRUE? 
What are your findings in terms of speed improvements (if any)?


Am 14.09.2016 um 19:34 schrieb Colin Adams:

No.
Doesn't happen anymore.

On Wed, 14 Sep 2016 at 18:26 Ulrich Pegelow mailto:ulrich.pege...@tongareva.de>> wrote:

Any backtrace?

Am 14.09.2016 um 19:12 schrieb Colin Adams:
> It causes darktable 2.0.5 (Fedora) to crash. Switching back to false
> cures the problem. So please don't change.



darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

Re: [darktable-user] open CL 2.0.6

[Colin Adams]

No.
Doesn't happen anymore.

On Wed, 14 Sep 2016 at 18:26 Ulrich Pegelow 
wrote:

> Any backtrace?
>
> Am 14.09.2016 um 19:12 schrieb Colin Adams:
> > It causes darktable 2.0.5 (Fedora) to crash. Switching back to false
> > cures the problem. So please don't change.
> >
> > On Wed, 14 Sep 2016 at 17:56 Ulrich Pegelow  > > wrote:
> >
> > Well, there obviously is an issue with OpenCL and NVIDIA. However, a
> > quick check reveals that this is not related to 2.0.6 versus 2.0.5.
> >
> > In fact it seems that NVIDIA did some changes to their drivers in the
> > way they handle memory transfers over the IDE interface.
> >
> > There is a quick fix for that in darktable. You can switch config
> > variable opencl_use_pinned_memory to TRUE (can be found in
> darktablerc).
> > At least here on my this makes a difference of up to a factor of 30
> > (oldish GeForce GTS 450 and 367.35 driver).
> >
> > Background: that switch controls the way of memory transfer between
> host
> > and OpenCL device, namely the use of pre-pinned memory. When the flag
> > was introduced it did only make some improvements on AMD/ATI devices,
> > while at that time NVIDIA devices would show no or a slight negative
> > effects. Therefore the flag is set to FALSE by default. It seems that
> > newer NVIDIA drivers get extremely slow if the default non-pinned
> memory
> > transfer method is used.
> >
> > If my findings are confirmed we will change the default setting of
> that
> > flag for new installations. Users of existing installations will
> need to
> > change the config flag manually.
> >
> > Please check and report back.
> >
> > Ulrich
> >
>
>
> 
> darktable user mailing list
> to unsubscribe send a mail to
> darktable-user+unsubscr...@lists.darktable.org
>
>


darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

Re: [darktable-user] open CL 2.0.6

[Ulrich Pegelow]

Any backtrace?

Am 14.09.2016 um 19:12 schrieb Colin Adams:

It causes darktable 2.0.5 (Fedora) to crash. Switching back to false
cures the problem. So please don't change.

On Wed, 14 Sep 2016 at 17:56 Ulrich Pegelow mailto:ulrich.pege...@tongareva.de>> wrote:

Well, there obviously is an issue with OpenCL and NVIDIA. However, a
quick check reveals that this is not related to 2.0.6 versus 2.0.5.

In fact it seems that NVIDIA did some changes to their drivers in the
way they handle memory transfers over the IDE interface.

There is a quick fix for that in darktable. You can switch config
variable opencl_use_pinned_memory to TRUE (can be found in darktablerc).
At least here on my this makes a difference of up to a factor of 30
(oldish GeForce GTS 450 and 367.35 driver).

Background: that switch controls the way of memory transfer between host
and OpenCL device, namely the use of pre-pinned memory. When the flag
was introduced it did only make some improvements on AMD/ATI devices,
while at that time NVIDIA devices would show no or a slight negative
effects. Therefore the flag is set to FALSE by default. It seems that
newer NVIDIA drivers get extremely slow if the default non-pinned memory
transfer method is used.

If my findings are confirmed we will change the default setting of that
flag for new installations. Users of existing installations will need to
change the config flag manually.

Please check and report back.

Ulrich




darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

Re: [darktable-user] Fwd: Bouncing messages from darktable-user@lists.darktable.org

[Niranjan Rao]

I also got 2 messages. Gmail otherwise seems to be working ok.

On 09/14/2016 09:30 AM, Michael wrote:

I've received two of these messages today. Is something wrong?

-- Forwarded message --
From: >

Date: Wed, Sep 14, 2016 at 12:00 PM
Subject: Bouncing messages from darktable-user@lists.darktable.org 


To: bmi...@gmail.com 


Hi, this is the Mlmmj program managing the
> mailing list.


Some messages to you could not be delivered. If you're seeing this
message it means things are back to normal, and it's merely for your
information.

Here is the list of the bounced messages:
- 1150





--
:-)~MIKE~(-:

 
darktable user mailing list to unsubscribe send a mail to 
darktable-user+unsubscr...@lists.darktable.org





darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

Re: [darktable-user] open CL 2.0.6

[Colin Adams]

It causes darktable 2.0.5 (Fedora) to crash. Switching back to false cures
the problem. So please don't change.

On Wed, 14 Sep 2016 at 17:56 Ulrich Pegelow 
wrote:

> Well, there obviously is an issue with OpenCL and NVIDIA. However, a
> quick check reveals that this is not related to 2.0.6 versus 2.0.5.
>
> In fact it seems that NVIDIA did some changes to their drivers in the
> way they handle memory transfers over the IDE interface.
>
> There is a quick fix for that in darktable. You can switch config
> variable opencl_use_pinned_memory to TRUE (can be found in darktablerc).
> At least here on my this makes a difference of up to a factor of 30
> (oldish GeForce GTS 450 and 367.35 driver).
>
> Background: that switch controls the way of memory transfer between host
> and OpenCL device, namely the use of pre-pinned memory. When the flag
> was introduced it did only make some improvements on AMD/ATI devices,
> while at that time NVIDIA devices would show no or a slight negative
> effects. Therefore the flag is set to FALSE by default. It seems that
> newer NVIDIA drivers get extremely slow if the default non-pinned memory
> transfer method is used.
>
> If my findings are confirmed we will change the default setting of that
> flag for new installations. Users of existing installations will need to
> change the config flag manually.
>
> Please check and report back.
>
> Ulrich
>
> Am 14.09.2016 um 00:47 schrieb I. Ivanov:
> > I find it strange...
> >
> > When I upgraded from 14.04 to 16.04 - DT was at version 2.0.5 and nvidia
> > 361. I actually experienced speed "gain" - did not clock it but it was
> > very noticeable. I worked in this state for several weeks - all happy,
> > no changes in settings to DT.
> >
> > 2.0.6 was installed on 2016-09-06. I noticed it works but did not test
> > any further. Then I didn't use the computer till 11th. Installed the
> > following updates
> >
> > 2016-09-11 19:56:16 status installed gnome-menus:amd64 3.13.3-6ubuntu3.1
> > 2016-09-11 19:56:16 status installed desktop-file-utils:amd64
> 0.22-1ubuntu5
> > 2016-09-11 19:56:17 status installed mime-support:all 3.59ubuntu1
> > 2016-09-11 19:56:17 status installed bamfdaemon:amd64
> > 0.5.3~bzr0+16.04.20160701-0ubuntu1
> > 2016-09-11 19:56:17 status installed man-db:amd64 2.7.5-1
> > 2016-09-11 19:56:18 status installed libc-bin:amd64 2.23-0ubuntu3
> > 2016-09-11 19:56:18 status installed dbus:amd64 1.10.6-1ubuntu3
> > 2016-09-11 19:56:18 status installed gconf2:amd64 3.2.6-3ubuntu6
> > 2016-09-11 19:56:18 status installed hicolor-icon-theme:all 0.15-0ubuntu1
> > 2016-09-11 19:56:18 status installed libglib2.0-0:i386
> > 2.48.1-1~ubuntu16.04.1
> > 2016-09-11 19:56:18 status installed libglib2.0-0:amd64
> > 2.48.1-1~ubuntu16.04.1
> > 2016-09-11 19:56:18 status installed sgml-base:all 1.26+nmu4ubuntu1
> > 2016-09-11 19:56:19 status installed google-chrome-stable:amd64
> > 53.0.2785.101-1
> > 2016-09-11 19:56:19 status installed libp11-kit0:amd64
> > 0.23.2-5~ubuntu16.04.1
> > 2016-09-11 19:56:19 status installed libp11-kit0:i386
> 0.23.2-5~ubuntu16.04.1
> > 2016-09-11 19:56:19 status installed p11-kit-modules:amd64
> > 0.23.2-5~ubuntu16.04.1
> > 2016-09-11 19:56:19 status installed libaccountsservice0:amd64
> > 0.6.40-2ubuntu11.2
> > 2016-09-11 19:56:19 status installed accountsservice:amd64
> > 0.6.40-2ubuntu11.2
> > 2016-09-11 19:56:19 status installed file-roller:amd64 3.16.5-0ubuntu1.2
> > 2016-09-11 19:56:19 status installed gnome-font-viewer:amd64
> 3.16.2-1ubuntu1
> > 2016-09-11 19:56:19 status installed libappstream-glib8:amd64
> > 0.5.13-1ubuntu3
> > 2016-09-11 19:56:19 status installed libimlib2:amd64 1.4.7-1ubuntu0.1
> > 2016-09-11 19:56:19 status installed metacity-common:all
> 1:3.18.7-0ubuntu0.1
> > 2016-09-11 19:56:19 status installed libmetacity-private3a:amd64
> > 1:3.18.7-0ubuntu0.1
> > 2016-09-11 19:56:19 status installed libnm-gtk-common:all
> > 1.2.0-0ubuntu0.16.04.4
> > 2016-09-11 19:56:19 status installed libnm-gtk0:amd64
> 1.2.0-0ubuntu0.16.04.4
> > 2016-09-11 19:56:19 status installed libnma-common:all
> > 1.2.0-0ubuntu0.16.04.4
> > 2016-09-11 19:56:19 status installed libnma0:amd64 1.2.0-0ubuntu0.16.04.4
> > 2016-09-11 19:56:19 status installed network-manager-gnome:amd64
> > 1.2.0-0ubuntu0.16.04.4
> > 2016-09-11 19:56:21 status installed snapd:amd64 2.14.2~16.04
> > 2016-09-11 19:56:21 status installed p11-kit:amd64 0.23.2-5~ubuntu16.04.1
> > 2016-09-11 19:56:21 status installed libc-bin:amd64 2.23-0ubuntu3
> >
> > and noticed drop in performance - mainly when using darktable (not much
> > light table). Took a chance to turn off open CL and the performance
> > improved. After reading the thread
> >
> >
> https://www.mail-archive.com/darktable-dev@lists.darktable.org/msg01176.html
> >
> > Tried to compare with export of a single image.
> > without open CL - 23s for about 20 MB RAW.
> > Same image - no change
> > with open CL - 41s
> >
> > The OS and the images are stored on SSD so the networking does no

Re: [darktable-user] Making a local colour change?

[Ariel Kanterewicz]

If you want to force a particular color, the "colorize" module will do.

On Wed, Sep 14, 2016 at 1:55 PM Colin Adams 
wrote:

> To make it explicit, if it wasn't already clear - I know what it should
> look like - I just need to change the two areas (I can draw a mask) to that
> particular colour.
> I just don't know what module I can use to easily do that.
> I looked at the modules in the color section, and didn't see one I thought
> I knew how to use.
>
> On Wed, 14 Sep 2016 at 17:50 Colin Adams  wrote:
>
>> I don't think it does.
>> Color reconstruction module uses surrounding colour. That won't work here.
>>
>> On Wed, 14 Sep 2016 at 17:35 Ariel Kanterewicz  wrote:
>>
>>> You may want to look at this post from the blog:
>>> http://www.darktable.org/2015/03/color-reconstruction/
>>> It explains a solution for pretty much the same issue you have here.
>>>
>>> On Wed, Sep 14, 2016 at 4:54 AM Colin Adams 
>>> wrote:
>>>
 I took this photo with flash:
 https://www.dropbox.com/s/f6bmy554la7quho/132441800.jpg?dl=0

 and it is clearly overexposed in the foreground. Using the graduated
 density module gives a very nice result, all except for the two large
 yellow oval patches on the thorax - these should be a (yellowish) green.
 The histogram for these areas shows that both the red and green
 channels are blown out in these areas. But I guess I should be able to
 alter the colour locally in some way (by reducing the red channel, and
 maybe some of the green). What's the best module to use to do this?

 
 darktable user mailing list to unsubscribe send a mail to
 darktable-user+unsubscr...@lists.darktable.org

>>>


darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

Re: [darktable-user] open CL 2.0.6

[Ulrich Pegelow]

Well, there obviously is an issue with OpenCL and NVIDIA. However, a 
quick check reveals that this is not related to 2.0.6 versus 2.0.5.


In fact it seems that NVIDIA did some changes to their drivers in the 
way they handle memory transfers over the IDE interface.


There is a quick fix for that in darktable. You can switch config 
variable opencl_use_pinned_memory to TRUE (can be found in darktablerc). 
At least here on my this makes a difference of up to a factor of 30 
(oldish GeForce GTS 450 and 367.35 driver).


Background: that switch controls the way of memory transfer between host 
and OpenCL device, namely the use of pre-pinned memory. When the flag 
was introduced it did only make some improvements on AMD/ATI devices, 
while at that time NVIDIA devices would show no or a slight negative 
effects. Therefore the flag is set to FALSE by default. It seems that 
newer NVIDIA drivers get extremely slow if the default non-pinned memory 
transfer method is used.


If my findings are confirmed we will change the default setting of that 
flag for new installations. Users of existing installations will need to 
change the config flag manually.


Please check and report back.

Ulrich

Am 14.09.2016 um 00:47 schrieb I. Ivanov:

I find it strange...

When I upgraded from 14.04 to 16.04 - DT was at version 2.0.5 and nvidia
361. I actually experienced speed "gain" - did not clock it but it was
very noticeable. I worked in this state for several weeks - all happy,
no changes in settings to DT.

2.0.6 was installed on 2016-09-06. I noticed it works but did not test
any further. Then I didn't use the computer till 11th. Installed the
following updates

2016-09-11 19:56:16 status installed gnome-menus:amd64 3.13.3-6ubuntu3.1
2016-09-11 19:56:16 status installed desktop-file-utils:amd64 0.22-1ubuntu5
2016-09-11 19:56:17 status installed mime-support:all 3.59ubuntu1
2016-09-11 19:56:17 status installed bamfdaemon:amd64
0.5.3~bzr0+16.04.20160701-0ubuntu1
2016-09-11 19:56:17 status installed man-db:amd64 2.7.5-1
2016-09-11 19:56:18 status installed libc-bin:amd64 2.23-0ubuntu3
2016-09-11 19:56:18 status installed dbus:amd64 1.10.6-1ubuntu3
2016-09-11 19:56:18 status installed gconf2:amd64 3.2.6-3ubuntu6
2016-09-11 19:56:18 status installed hicolor-icon-theme:all 0.15-0ubuntu1
2016-09-11 19:56:18 status installed libglib2.0-0:i386
2.48.1-1~ubuntu16.04.1
2016-09-11 19:56:18 status installed libglib2.0-0:amd64
2.48.1-1~ubuntu16.04.1
2016-09-11 19:56:18 status installed sgml-base:all 1.26+nmu4ubuntu1
2016-09-11 19:56:19 status installed google-chrome-stable:amd64
53.0.2785.101-1
2016-09-11 19:56:19 status installed libp11-kit0:amd64
0.23.2-5~ubuntu16.04.1
2016-09-11 19:56:19 status installed libp11-kit0:i386 0.23.2-5~ubuntu16.04.1
2016-09-11 19:56:19 status installed p11-kit-modules:amd64
0.23.2-5~ubuntu16.04.1
2016-09-11 19:56:19 status installed libaccountsservice0:amd64
0.6.40-2ubuntu11.2
2016-09-11 19:56:19 status installed accountsservice:amd64
0.6.40-2ubuntu11.2
2016-09-11 19:56:19 status installed file-roller:amd64 3.16.5-0ubuntu1.2
2016-09-11 19:56:19 status installed gnome-font-viewer:amd64 3.16.2-1ubuntu1
2016-09-11 19:56:19 status installed libappstream-glib8:amd64
0.5.13-1ubuntu3
2016-09-11 19:56:19 status installed libimlib2:amd64 1.4.7-1ubuntu0.1
2016-09-11 19:56:19 status installed metacity-common:all 1:3.18.7-0ubuntu0.1
2016-09-11 19:56:19 status installed libmetacity-private3a:amd64
1:3.18.7-0ubuntu0.1
2016-09-11 19:56:19 status installed libnm-gtk-common:all
1.2.0-0ubuntu0.16.04.4
2016-09-11 19:56:19 status installed libnm-gtk0:amd64 1.2.0-0ubuntu0.16.04.4
2016-09-11 19:56:19 status installed libnma-common:all
1.2.0-0ubuntu0.16.04.4
2016-09-11 19:56:19 status installed libnma0:amd64 1.2.0-0ubuntu0.16.04.4
2016-09-11 19:56:19 status installed network-manager-gnome:amd64
1.2.0-0ubuntu0.16.04.4
2016-09-11 19:56:21 status installed snapd:amd64 2.14.2~16.04
2016-09-11 19:56:21 status installed p11-kit:amd64 0.23.2-5~ubuntu16.04.1
2016-09-11 19:56:21 status installed libc-bin:amd64 2.23-0ubuntu3

and noticed drop in performance - mainly when using darktable (not much
light table). Took a chance to turn off open CL and the performance
improved. After reading the thread

https://www.mail-archive.com/darktable-dev@lists.darktable.org/msg01176.html

Tried to compare with export of a single image.
without open CL - 23s for about 20 MB RAW.
Same image - no change
with open CL - 41s

The OS and the images are stored on SSD so the networking does not come
into play.
I can work without open CL - it is not a deal breaker but the behavior
is surprising.

Regards,
B



darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

Re: [darktable-user] Making a local colour change?

[Colin Adams]

To make it explicit, if it wasn't already clear - I know what it should
look like - I just need to change the two areas (I can draw a mask) to that
particular colour.
I just don't know what module I can use to easily do that.
I looked at the modules in the color section, and didn't see one I thought
I knew how to use.

On Wed, 14 Sep 2016 at 17:50 Colin Adams  wrote:

> I don't think it does.
> Color reconstruction module uses surrounding colour. That won't work here.
>
> On Wed, 14 Sep 2016 at 17:35 Ariel Kanterewicz  wrote:
>
>> You may want to look at this post from the blog:
>> http://www.darktable.org/2015/03/color-reconstruction/
>> It explains a solution for pretty much the same issue you have here.
>>
>> On Wed, Sep 14, 2016 at 4:54 AM Colin Adams 
>> wrote:
>>
>>> I took this photo with flash:
>>> https://www.dropbox.com/s/f6bmy554la7quho/132441800.jpg?dl=0
>>>
>>> and it is clearly overexposed in the foreground. Using the graduated
>>> density module gives a very nice result, all except for the two large
>>> yellow oval patches on the thorax - these should be a (yellowish) green.
>>> The histogram for these areas shows that both the red and green channels
>>> are blown out in these areas. But I guess I should be able to alter the
>>> colour locally in some way (by reducing the red channel, and maybe some of
>>> the green). What's the best module to use to do this?
>>>
>>> 
>>> darktable user mailing list to unsubscribe send a mail to
>>> darktable-user+unsubscr...@lists.darktable.org
>>>
>>


darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

Re: [darktable-user] Making a local colour change?

[Colin Adams]

I don't think it does.
Color reconstruction module uses surrounding colour. That won't work here.

On Wed, 14 Sep 2016 at 17:35 Ariel Kanterewicz  wrote:

> You may want to look at this post from the blog:
> http://www.darktable.org/2015/03/color-reconstruction/
> It explains a solution for pretty much the same issue you have here.
>
> On Wed, Sep 14, 2016 at 4:54 AM Colin Adams 
> wrote:
>
>> I took this photo with flash:
>> https://www.dropbox.com/s/f6bmy554la7quho/132441800.jpg?dl=0
>>
>> and it is clearly overexposed in the foreground. Using the graduated
>> density module gives a very nice result, all except for the two large
>> yellow oval patches on the thorax - these should be a (yellowish) green.
>> The histogram for these areas shows that both the red and green channels
>> are blown out in these areas. But I guess I should be able to alter the
>> colour locally in some way (by reducing the red channel, and maybe some of
>> the green). What's the best module to use to do this?
>>
>> 
>> darktable user mailing list to unsubscribe send a mail to
>> darktable-user+unsubscr...@lists.darktable.org
>>
>


darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

Re: [darktable-user] Making a local colour change?

[Ariel Kanterewicz]

You may want to look at this post from the blog:
http://www.darktable.org/2015/03/color-reconstruction/
It explains a solution for pretty much the same issue you have here.

On Wed, Sep 14, 2016 at 4:54 AM Colin Adams 
wrote:

> I took this photo with flash:
> https://www.dropbox.com/s/f6bmy554la7quho/132441800.jpg?dl=0
>
> and it is clearly overexposed in the foreground. Using the graduated
> density module gives a very nice result, all except for the two large
> yellow oval patches on the thorax - these should be a (yellowish) green.
> The histogram for these areas shows that both the red and green channels
> are blown out in these areas. But I guess I should be able to alter the
> colour locally in some way (by reducing the red channel, and maybe some of
> the green). What's the best module to use to do this?
>
> 
> darktable user mailing list to unsubscribe send a mail to
> darktable-user+unsubscr...@lists.darktable.org
>


darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

[darktable-user] Fwd: Bouncing messages from darktable-user@lists.darktable.org

[Michael]

I've received two of these messages today. Is something wrong?

-- Forwarded message --
From: 
Date: Wed, Sep 14, 2016 at 12:00 PM
Subject: Bouncing messages from darktable-user@lists.darktable.org
To: bmi...@gmail.com


Hi, this is the Mlmmj program managing the
 mailing list.

Some messages to you could not be delivered. If you're seeing this
message it means things are back to normal, and it's merely for your
information.

Here is the list of the bounced messages:
- 1150





-- 
:-)~MIKE~(-:


darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

Re: [darktable-user] 360 degree panoramas

[Michael]

that is so easy. Stitch together with hugin then upload to www.360cities.net.
I just used my regular rectangular lens.   NO special equipment was needed.
I was zoomed to 18mm. I probably will need the special equioment when I do
indoor panoramas. Actually I just need to stitch a couple of images
together to simulate a wide angle lens (wider than 18mm at least).

On Wed, Sep 14, 2016 at 3:32 AM, Tomas Sobek  wrote:

> Hi Michael,
> In order to produce image like that you will need to dive into panorama
> photography. Personally I use Darktable to process my panorama images
> before a stitch and then stitch them using Hugin. More elaborate processes
> might have their advantages but I like to keep it simple. I shoot with DSLR
> + fisheye lens, tripod and panoramic bracket to keep the number of images
> low and stitching relatively easy. There are also specialised 360 degrees
> lenses available on the market, but I haven't experimented with any of them.
>
> As a general intro, read for example at http://www.digitaltrends.com/
> photography/photography-101-how-to-shoot-360-degree-panoramas/
> If you chose to use Hugin for stitching (it would be a natural choice on
> Linux), there are useful tutorials available -
> http://hugin.sourceforge.net/tutorials/index.shtml
> I noticed that the panorama you referred to is using Flash for
> presentation. I would suggest using a JavaScript based panorama player
> these days. Flash usage is generally deprecated. Check out for example free
> software https://pannellum.org/ - You can see more examples of its use on
> my site - https://tomassobekphotography.co.nz/panoramas.php
>
> As you can see, your question is a rather broad one. Panorama photography
> might have a steep learning curve. However it is rewarding and worth the
> effort.
> Cheers, Tomas
>
> -- Původní zpráva --
> Od: Michael 
> Datum: 14. 9. 2016 6:27:55
> Předmět: [darktable-user] 360 degree panoramas
>
> Is there a way to do 360 degree panoramas with darktable like this one:
> http://tinyurl.com/35tfq9q ? HOw would you recommend I create one?
>
> 
> darktable user mailing list to unsubscribe send a mail to
> darktable-user+unsubscr...@lists.darktable.org
>
>


-- 
:-)~MIKE~(-:


darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

Re: [darktable-user]

[Tobias Ellinghaus]

Am Mittwoch, 14. September 2016, 17:02:45 CEST schrieb kev:
> Hi,

Hi.

> I'm having trouble with watermarks: How do you change the text colour?
> 
> Yes, I've selected a colour via the colour chooser but how to I apply that
> colour to the current image?

Is that with the simple-text example that comes with darktable or a custom 
one? In the first case it should just work. With a custom SVG file you would 
have to open the SVG in a text editor and replace the color strings for the 
text (something like "#00") with "$(WATERMARK_COLOR)".

If you can't get it to work you can send me the SVG and I will edit it for 
you. Or just look at the file "simple-text.svg" in your darktable installation 
by opening it in a text editor.

> Thanks in advance,
> Kevin

Tobias

signature.asc
Description: This is a digitally signed message part.

Re: [darktable-user] Darktable 2.0.6 dmg?

[Tobias Ellinghaus]

Am Dienstag, 13. September 2016, 18:58:01 CEST schrieb J Albrecht:
> Hello All,

Hi.

> I feel that I’m looking a gift horse into the mouth but, I’ll ask
> nonetheless: Is a 2.0.6 dmg package available yet? I’ve looked but could
> only find the 2.0.5 (which I’m already running on my MBPr)

Those are created by one person only and not by the darktable project as a 
whole. So all I can say that they will be available as soon as he gets around 
making them. Sorry for the non-answer, but that's all I can tell you. :-(

Tobias

signature.asc
Description: This is a digitally signed message part.

Re: [darktable-user] tethering and size of center view image

[Tobias Ellinghaus]

Am Mittwoch, 14. September 2016, 07:39:14 CEST schrieb Kohler Gerard:
> Hello,

Hi.

> sory for my bad english,
> 
> 
> I use Darktable 2.0.5 with Debian Stretch and KDE 5
> 
> my APN is Nikon D800
> 
> when I use tethering the size of the center view image is very little
> and does not occupy all the space possible
> 
> I don't find how config this
> 
> some ideas ?

What is the resolution of your monitor? Currently we just use the preview 
image handed over from the camera and dump that to the screen without scaling. 
So when the camera only delivers a small preview while the monitor resolution 
is big you will end up with a small live view.

You could also try installing the package "gphoto2" and running this from the 
command line:

gphoto2 --capture-preview

That should create a JPEG file. Please check the resolution of that to see what 
the camera gives darktable to work with.

> gerard

Tobias

signature.asc
Description: This is a digitally signed message part.

Re: [darktable-user] 360 degree panoramas

[Michael]

Sorry about having a broad question but I am just starting out with this so
I must start broad. And my broad question led to (what I suppose) are broad
answers which is just what I need as a starting point.
So, I suppose I will start with some specific questions:
What equipment should I get?
You say a fish eye lens. Other sites I've looked at in my research
recommend an 8mm. Is that good?
It has also been recommended I get a nodal ninja. Would you suggest that as
well?
I there any other equipment you would recommend?
You mentioned a "panoramic bracket" What is a "panoramic bracket"?...
my investigation into it shows that this is what a nodal ninja is but I
need to be sure that they are the same thing.
One thing further when asking around about how to identify the location  of
my lens "pupil" I was told that it was more or less in the middle of the
lens... even with a zoom lens. HOw would I find the pupil with the 8mm
(which I will get later) and with a zoom lens (which I have now).

On Wed, Sep 14, 2016 at 3:32 AM, Tomas Sobek  wrote:

> Hi Michael,
> In order to produce image like that you will need to dive into panorama
> photography. Personally I use Darktable to process my panorama images
> before a stitch and then stitch them using Hugin. More elaborate processes
> might have their advantages but I like to keep it simple. I shoot with DSLR
> + fisheye lens, tripod and panoramic bracket to keep the number of images
> low and stitching relatively easy. There are also specialised 360 degrees
> lenses available on the market, but I haven't experimented with any of them.
>
> As a general intro, read for example at http://www.digitaltrends.com/
> photography/photography-101-how-to-shoot-360-degree-panoramas/
> If you chose to use Hugin for stitching (it would be a natural choice on
> Linux), there are useful tutorials available -
> http://hugin.sourceforge.net/tutorials/index.shtml
> I noticed that the panorama you referred to is using Flash for
> presentation. I would suggest using a JavaScript based panorama player
> these days. Flash usage is generally deprecated. Check out for example free
> software https://pannellum.org/ - You can see more examples of its use on
> my site - https://tomassobekphotography.co.nz/panoramas.php
>
> As you can see, your question is a rather broad one. Panorama photography
> might have a steep learning curve. However it is rewarding and worth the
> effort.
> Cheers, Tomas
>
> -- Původní zpráva --
> Od: Michael 
> Datum: 14. 9. 2016 6:27:55
> Předmět: [darktable-user] 360 degree panoramas
>
> Is there a way to do 360 degree panoramas with darktable like this one:
> http://tinyurl.com/35tfq9q ? HOw would you recommend I create one?
>
> 
> darktable user mailing list to unsubscribe send a mail to
> darktable-user+unsubscr...@lists.darktable.org
>
>


-- 
:-)~MIKE~(-:


darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

[darktable-user] Making a local colour change?

[Colin Adams]

I took this photo with flash:
https://www.dropbox.com/s/f6bmy554la7quho/132441800.jpg?dl=0

and it is clearly overexposed in the foreground. Using the graduated
density module gives a very nice result, all except for the two large
yellow oval patches on the thorax - these should be a (yellowish) green.
The histogram for these areas shows that both the red and green channels
are blown out in these areas. But I guess I should be able to alter the
colour locally in some way (by reducing the red channel, and maybe some of
the green). What's the best module to use to do this?


darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

Re: [darktable-user] 360 degree panoramas

[Tomas Sobek]

Hi Michael,
In order to produce image like that you will need to dive into panorama 
photography. Personally I use Darktable to process my panorama images before
a stitch and then stitch them using Hugin. More elaborate processes might 
have their advantages but I like to keep it simple. I shoot with DSLR + 
fisheye lens, tripod and panoramic bracket to keep the number of images low 
and stitching relatively easy. There are also specialised 360 degrees lenses
available on the market, but I haven't experimented with any of them.

As a general intro, read for example at http://www.digitaltrends.com/
photography/photography-101-how-to-shoot-360-degree-panoramas/
If you chose to use Hugin for stitching (it would be a natural choice on 
Linux), there are useful tutorials available - http://hugin.sourceforge.net/
tutorials/index.shtml
I noticed that the panorama you referred to is using Flash for presentation.
I would suggest using a JavaScript based panorama player these days. Flash 
usage is generally deprecated. Check out for example free software https://
pannellum.org/ - You can see more examples of its use on my site - https://
tomassobekphotography.co.nz/panoramas.php

As you can see, your question is a rather broad one. Panorama photography 
might have a steep learning curve. However it is rewarding and worth the 
effort.
Cheers, Tomas


-- Původní zpráva --
Od: Michael 
Datum: 14. 9. 2016 6:27:55
Předmět: [darktable-user] 360 degree panoramas

"







Is there a way to do 360 degree panoramas with darktable like this one: 
http://tinyurl.com/35tfq9q(http://tinyurl.com/35tfq9q) ? HOw would you 
recommend I create one?








darktable user mailing list to unsubscribe send a mail to darktable-user+
unsubscr...@lists.darktable.org 

"
darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org

[darktable-user]

[kev]

Hi,

I'm having trouble with watermarks: How do you change the text colour?

Yes, I've selected a colour via the colour chooser but how to I apply that 
colour to the current image?

Thanks in advance,
Kevin

darktable user mailing list
to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org