[darktable-user] Modify Export Filename with Lua

[Scott]

I've found several examples to register a new storage method using Lua
[1,2].  Is there instead a way to modify an existing one?  What I'd
like to do is use the standard "file on disk" output option, but I
want to modify the output path.  I use something like this right now:

$(FILE_FOLDER)/$(FILE_NAME)_$(VERSION)_DT

Where $(FILE_FOLDER) could be ~/Pictures_Dev/some/sub/directory.  I'd
like to replace it to output instead to ~/Pictures/some/sub/directory.
Basically I'll have my RAW and xmp files in the Pictures_Dev directory
and all of the outputs in my Pictures directory, with the same folder
structure.  I know the export path can use $(PICTURES_FOLDER) for
output, but then I'd lose the sub directory tree that I'd like to
maintain.  So ideally I could do something like
$(FILE_FOLDER).replace("/Pictures_Dev/", "/Pictures/").

Or is there a way to use Lua to create a new "filename template" [3]?
I could probably re-create a "file on disk 2" method, but it seems
like wasted work when all I want to do is change the output directory.

[1]: http://www.darktable.org/2013/09/using-lua-with-darktable/
[2]: https://www.darktable.org/usermanual/ch09.html.php#lua_storage_example
[3]: https://www.darktable.org/usermanual/ch02s03s12.html.php

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Re: [darktable-user] Fwd: how do I do it....

[David Vincent-Jones]

Most of it comes out fairly well with slight adjustments in TCA in the
'lens correction'.  It appears that the automatic correction for this
lens is not working.

red ... 0.2

blue ... 1.00054

David


On 02/25/2017 02:46 PM, Michael wrote:
> https://drive.google.com/drive/folders/0B2xvsVTZy4y1Nk5vZWNzMkpyUVU?usp=sharing
>
> How would I get rid of the halo around the life preserver and the
> baseboard (on the left side of the slider door)? I tried following
> Riley's directions in his darktable tutorial but I guess I did it wrong.
>
>
>
> -- 
> :-)~MIKE~(-:
>
>
>
> -- 
> :-)~MIKE~(-:
>
>
>
> -- 
> :-)~MIKE~(-:
>
> 
> darktable user mailing list to unsubscribe send a mail to
> darktable-user+unsubscr...@lists.darktable.org



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[darktable-user] Fwd: how do I do it....

[Michael]

https://drive.google.com/drive/folders/0B2xvsVTZy4y1Nk5vZWNzMkpyUVU?usp=sharing

How would I get rid of the halo around the life preserver and the baseboard
(on the left side of the slider door)? I tried following Riley's directions
in his darktable tutorial but I guess I did it wrong.



-- 
:-)~MIKE~(-:



-- 
:-)~MIKE~(-:



-- 
:-)~MIKE~(-:


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[darktable-user] Fujifilm X100F RAW crash

[Richard Shaw]

Hi,

I'm getting a couple issues loading RAW files from a Fujifilm X100F which
have used the Film Simulation filter.  Specifically:

Failed to read camera white balance information from blah
file has unknown format

On that last one, darktable crashed and I have the crash report which I'll
add to a bug report.

Is this RAW format not supported? if so, does anyone know when it's due to
be supported?

darktable 2.2.3 macOS 10.12.3

Regards,
R.


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[darktable-user] Apply Mask to Single LAB Channel

[Andrew Martin]

Hello,

I have been reading Photoshop LAB Color by Dan Margulis and learning about
various techniques in the LAB colorspace. Consequently, I'm excited that so
many Darktable modules operate in LAB! One thing I haven't figured out how
to do is to apply a module to a particular channel (either L, A, or B) -
how can I do that?

I tried creating a parametric mask, choosing either L, a, or b, and
adjusting the Input and Output sliders, but I was not able to select just a
single channel.

Moreover, is there a way I can view a single LAB channel by itself? This is
useful for example for checking which channel has more noise (A or B).

Thanks,

Andrew


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Re: [darktable-user] white balance

[Tim Rolph]

Hello, the card I use is two sided, it has white grey and black on one side 
and the standard 24 colors on the other and yes you can use Adobe DNG to 
produce a color profile for use in Lightroom and rawtherapee. However I use it 
mostly for a custom WB in camera on my 14 year old DSLR canon it is just a 
matter of taking one full frame image of the WB side of the card and then 
telling the camera to use the custom WB image. Of course you need to change 
images if the lighting changes significantly and you can also use it within dt 
with the spot wb option.
While on the subject of colour profiles I have recently used the excellent 
darktable-chart programme to create a profile and tone curve using a wolf faust 
it8 scanner calibration target that I purchased for 15.00 euros back in 2009 
and I can say it is better that any other profile that I have produced using 
any other method.

Tim.
 
On Saturday, 25 February 2017 16:10:36 GMT Remco Viëtor wrote:
> On samedi 25 février 2017 01:38:01 CET Marcus Sundman wrote:
> > Well, first we need sensible support for color cards in darktable. (Now
> > you have to go through crazy many hoops to set your whitebalance from a
> > color card, including multiple import/export and profile generation in
> > an external program and custom command line tools and whatnot.)
> 
> First you need a correctly calibrated and profiled screen (and printer if
> you plan on printing). Without that, you'd have to work strictly by the
> numbers, because there's no way you can visualise the final result. (OK, if
> you publish on the web, >90% of the viewers won't have a profiled screen,
> but at least you know how it should look)
> 
> Then, setting your white balance from a *colour* card is looking for trouble
> (if it is at all possible to get any decent white balance from such a
> card).
> 
> As has been said already, for a white balance, you need a neutral spot in
> your image: light or dark gray, but not white or black. (Such a spot can of
> course be a *neutral* spot on your colour card). Remember that 'setting the
> white balance' means changing the ratios green/red and green/blue (in
> practice, green is set to 1.0, and the red and blue channels are multiplied
> by one value each, depending on colour temperature and tint, DT _shows_
> those multipliers in the white balance module, and allows you to change
> them directly).
> 
> When you have that neutral spot in your image, in DT it's just a matter of
> choosing the "spot" mode in the white balance module and select a rectangle
> on the neutral spot.
> 
> The colour patches are used to create a *camera profile*, and yes, this
> needs an external programme (or two), just like screen or printer
> profiling. *Unlike* screen and printer profiling, it's something that's
> mostly needed for very colour critical work. (the few times I bothered with
> a camera profile, the results with a custom profile were identical or
> nearly identical to the default profile and I had no way to show which was
> better) And when you get to that level, you also have to be very careful
> about your lights all having the same colour, as the colour of the incoming
> lights influences what the camera "sees".
> 
> And just a small question: is there *any* raw developer that includes the
> possibility to generate an input profile from a colour card?
> 
> Remco
> 
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> to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org



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Re: [darktable-user] white balance

[Remco Viëtor]

On samedi 25 février 2017 01:38:01 CET Marcus Sundman wrote:

> Well, first we need sensible support for color cards in darktable. (Now
> you have to go through crazy many hoops to set your whitebalance from a
> color card, including multiple import/export and profile generation in
> an external program and custom command line tools and whatnot.)

First you need a correctly calibrated and profiled screen (and printer if you 
plan on printing). Without that, you'd have to work strictly by the numbers, 
because there's no way you can visualise the final result. (OK, if you publish 
on the web, >90% of the viewers won't have a profiled screen, but at least you 
know how it should look)

Then, setting your white balance from a *colour* card is looking for trouble 
(if it is at all possible to get any decent white balance from such a card).

As has been said already, for a white balance, you need a neutral spot in your 
image: light or dark gray, but not white or black. (Such a spot can of course 
be a *neutral* spot on your colour card). Remember that 'setting the white 
balance' means changing the ratios green/red and green/blue (in practice, 
green is set to 1.0, and the red and blue channels are multiplied by one value 
each, depending on colour temperature and tint, DT _shows_ those multipliers 
in the white balance module, and allows you to change them directly).

When you have that neutral spot in your image, in DT it's just a matter of 
choosing the "spot" mode in the white balance module and select a rectangle on 
the neutral spot.

The colour patches are used to create a *camera profile*, and yes, this needs 
an external programme (or two), just like screen or printer profiling. 
*Unlike* screen and printer profiling, it's something that's mostly needed for 
very colour critical work. (the few times I bothered with a camera profile, 
the results with a custom profile were identical or nearly identical to the 
default profile and I had no way to show which was better) And when you get to 
that level, you also have to be very careful about your lights all having the 
same colour, as the colour of the incoming lights influences what the camera 
"sees".

And just a small question: is there *any* raw developer that includes the 
possibility to generate an input profile from a colour card? 

Remco

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Re: [darktable-user] Darktable with fujifilm, oversaturated blues.

[Remco Viëtor]

On samedi 25 février 2017 11:47:44 CET alex wrote:
> I have some serious trouble using darktable with fuji's raw files. It
> seems that certain shades of deep blue are completely oversaturated,
> worst is blue ledlight. Rawtherapee handles the files just fine and in
> camera jpegs are also very good but darktable is doing something strange
> to the files. Link below contains a couple of shots and the rawfile in
> question.
> 
> https://www.dropbox.com/sh/7orybjumfljmt58/AACP22Pckk7mSTfITt8xFUB9a?dl=0
> 
That's a known phenomenon, and described in the manual, and it's not limited 
to Fuji raw files (I see it with my Sony raws as well). Iirc, it's caused by 
DT using unconstrained values within its pipeline, and some modules don't like 
L values outside the 0..1 range. 

A (partial) solution is to set gamut clipping in the "input profile" module to 
something else than off. What can also work is lowering the saturation with a 
parametric mask limiting the effect to the intense blues.

Remco

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Re: [darktable-user] Width of Drop-Downs in GUI buggy?

[Roman Lebedev]

On Sat, Feb 25, 2017 at 7:58 AM, HaJo Schatz  wrote:
> Hi group,
>
> I recently upgraded to F25 and with it to DT 2.2.3. Since then I have an
> issue that the drop-downs (GTK ComboBox?) isn't wide enough, see this:
> https://ibin.co/3DZa1O5OgUv6.png
This is at least second bugreport like this.

> Is this my stupidity or should I file a bug?
There doesn't seem to be any way how this could be a dt bug, unfortunately.
It's likely a gtk bug.

> Thx a lot,
> Hajo
Roman.

> --
> Sent from my mobile device, apologies for typos
>
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>
> 
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