Re: [Gimp-user] any tricks for making black look really black

[Gez]

Kevin Cozens wrote:

> When it comes to printing, black ink by itself won't give you a real
> dark black. The blackest-black you can get when printing in CMYK is
> C-75 M-68 Y-67 K-90 (from a formula on a web page). These percentages
> are different than I remembered. The main idea is that you need more
> than just black ink. 

That's not correct.
The amount of black generation is controlled by the target CMYK
profile, and you just can't create something that is blacker than your
RGB black when working in RGB.
GIMP is an RGB editor, it can't produce CMYK separations unless you use
a plugin, so the CMYK value in the picker is just a guide of how your
colors are going to be separated when your RGB image is converted to a
specific CMYK space.
You can't force values.

Those CMYK values you provided could be good for a certain CMYK space
(which as a 300% total area coverage) but could be unsuitable for other
colorspaces.

At the end it doesn't even matter, as you're absolutely unable to
control how the profile will separate your RGB into CMYK unless you're
using a tool that lets you control that.

In kwisj's case, I'd try to figure out why the printer is producing a
weak black separation (maybe pulling a pure black from the separation,
without any CMY beneath).
That's unlikely that is caused by GIMP or the file produced in GIMP, it
would be the same producing an sRGB image from any other program.

Gez.
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Re: [Gimp-user] Elementary question for an old mapmaker

[Ross Martinek]

Hello Peter,

Yes, GIMP will import most graphics files, and you can use layers to trace over 
them. It does have a wide typographic  library, and appears to recognize all 
the fonts installed on your system. I am working with GIMP and a map I 
originally sketched in Adobe Photoshop (a software I have abandoned completely 
in favor of GIMP.) 

However, you should, as others recommend, investigate Inkscape (as I intend to 
do in the near future). If you are on a Mac OS, take a look at 
http://www.mapdiva.com/ortelius/.

All of these programs have fairly steep learning curves if you are not familiar 
with CG, however, the time spent is ultimately worth it.

Ross

On Nov 27, 2015, at 11:42 AM, petersh...@comcast.net wrote:

> I've just finished hand drawing about fifty simple, small (8.5 X 11) maps in 
> a two-month period. I'm hoping for an easier way, without going broke or 
> making my head explode. 
> 
> I've read a summary of the GIMP drawing program, but it is not clear to me, 
> if you can import images such as scans, or Google Earth. Google maps, etc. 
> Can you import an image and trace from it, or does one only draw original 
> subjects? I assume it has wide typographic ability for font and sizes?? 
> 
> Thanks, 
> 
> Peter 
> 
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Re: [Gimp-user] Elementary question for an old mapmaker

[Americo Gobbo]

Hello,
in 2013 I had the opportunity to put in praxis a process to paint a big map
(250x190 cm) using GIMP and MyPaint.
You can see my approach to this work... but is in Portuguese... but I think
that the google translate can help a bit.
The posts about this work and process are:
http://forksanddrills.blogspot.com/2013/05/fazendo-mapas-enormes-com-mypaint-e-o.html
http://forksanddrills.blogspot.com/2013/06/cartografia.html

Americo

On Sun, Nov 29, 2015 at 5:39 PM, Ross Martinek  wrote:

> Hello Peter,
>
> Yes, GIMP will import most graphics files, and you can use layers to trace
> over them. It does have a wide typographic  library, and appears to
> recognize all the fonts installed on your system. I am working with GIMP
> and a map I originally sketched in Adobe Photoshop (a software I have
> abandoned completely in favor of GIMP.)
>
> However, you should, as others recommend, investigate Inkscape (as I
> intend to do in the near future). If you are on a Mac OS, take a look at
> http://www.mapdiva.com/ortelius/.
>
> All of these programs have fairly steep learning curves if you are not
> familiar with CG, however, the time spent is ultimately worth it.
>
> Ross
>
> On Nov 27, 2015, at 11:42 AM, petersh...@comcast.net wrote:
>
> > I've just finished hand drawing about fifty simple, small (8.5 X 11)
> maps in a two-month period. I'm hoping for an easier way, without going
> broke or making my head explode.
> >
> > I've read a summary of the GIMP drawing program, but it is not clear to
> me, if you can import images such as scans, or Google Earth. Google maps,
> etc. Can you import an image and trace from it, or does one only draw
> original subjects? I assume it has wide typographic ability for font and
> sizes??
>
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Re: [Gimp-user] any tricks for making black look really black

[Gez]

El dom, 29-11-2015 a las 16:47 -0300, Gez escribió:
> 
> In kwisj's case, I'd try to figure out why the printer is producing a
> weak black separation (maybe pulling a pure black from the
> separation,
> without any CMY beneath).
> That's unlikely that is caused by GIMP or the file produced in GIMP,
> it
> would be the same producing an sRGB image from any other program.

Aaaand, replying to myself. If that's what I suspect (the printer/RIP
producing pure K plate from the achromatic values), maybe there is a
way to prevent it:

Try to add some color. Instead of pure black, use RGB 1,1,5.

Sometime RIPs, Printer drivers and preflight softwares have specific
rules, as converting pure black to K-only black.
By making it very dark gray and adding some tint to it, you cheat the
RIP so it doesn't do that.

That should work giving you a nice, deep black. Try it and let us know
how it went.

Gez.
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Re: [Gimp-user] HEX to Pantone Color Conversion

[Gez]

On 11/25/2015 05:42 PM, Chris Mohler wrote:

> I know of no reliable method (aside from having a swatch book and
> using the mark-one eyeball).  That being said, try this:
> http://rgb.to/hex/3e479a
> 
> Or if you search the web for "HEX to Pantone", you will see some
> other
> tools pop up.
> 
> Also, (I think) Pantone used to have a color lookup on their own
> site.
> But I can't find it anymore.
> 
> But once again - I doubt any of these tools are super-reliable.  This
> is from someone who used to mix Pantone ink colors.

Pantone Formula digital swatches are stored in CIE Lab colorspace,
which means that it is possible to reliabily choose a close match for a
RGB value, given that we know *which* RGB colorspace those values
belong to.

An hex RGB value means nothing if we don't know the colorspace, so any
conversion will be based on an assumption, we can't really know.

So the very first question is: What RGB is that RGB value?
Is sRGB? If not, what colorspace?

Once you know that, you have to convert the RGB value to Lab and find
the closest match for your Pantone.
iirc, the Lab values of the Pantone Formula guide could be loaded from
Pantone Xref using Swatchbooker.

Gez.
 
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Re: [Gimp-user] [Gimp-developer] ANNOUNCE: GIMP 2.9.2 released

[C R]

Thanks to the development team and everyone who has contributed to this
monumental step! I use GIMP every day and have processed over one hundred
thousand images with it already. So thanks so much for this tremendous
gift, I can't wait to test the new features!

One question, can someone put together a step-by-step for compiling it
(including babl and gegl) under Ubuntu? I've been trying, but can't seem to
get gegl installed correctly. It says it's not installed, when clearly it
is (even the latest version from git).

Thanks for any help.

-C

On Thu, Nov 26, 2015 at 7:46 PM, Boudewijn Rempt  wrote:

> Congratulations!
>
>
> On Thu, 26 Nov 2015, Michael Natterer wrote:
>
> Hi,
>>
>> We originally wanted to get this done on GIMP's 20th
>> birthday last week, but...
>>
>> Anyway, here is the first development release in the
>> GIMP 2.9.x series leading to GIMP 2.10.
>>
>> This is an unstable development preview and might crash
>> or do whatever. If you try it for work, please save your
>> images more often.
>>
>> GIMP 2.9's major new feature is GEGL (www.gegl.org), a graph
>> based image processing framework. The entire old pixel
>> manipulation core of GIMP has been removed and replaced
>> by GEGL. Most internal processing is now done at floating
>> point precision, and images can be kept around at 16-bit
>> and 32-bit integer and floating point precisions. Many
>> plug-ins have already been replaced by GEGL operations
>> and can be previewed live on the canvas.
>>
>> For a complete list of changes since 2.8.0 please see the
>> "Changes" section below. We will also post more detailed
>> news about GIMP 2.9 on www.gimp.org soon, stay tuned.
>>
>> Happy GIMPing,
>> --Mitch
>>
>>
>> Download
>> 
>>
>>   GIMP 2.9.2 is available from:
>>
>>   http://download.gimp.org/pub/gimp/v2.9/
>>
>>   and from the mirrors listed at:
>>
>>   http://www.gimp.org/downloads/#mirrors
>>
>>   Please use the torrent, it distributes
>>   the download bandwidth across all mirrors:
>>
>>   http://download.gimp.org/pub/gimp/v2.9/gimp-2.9.2.tar.bz2.torrent
>>
>>   The checksum of the tarball is:
>>
>>   aa8a846a497e3328c5b7d2fd33f5cf63  gimp-2.9.2.tar.bz2
>>
>>
>>
>> Overview of Changes from GIMP 2.8.0 to GIMP 2.9.2
>> =
>>
>> Core:
>>
>>   The core got completely ported to GEGL, listing all changes involved
>>   would be too much, therefore we summarize the changes in app/ per
>>   source subdirectory:
>>
>>   base
>>   composite
>>   paint-funcs:
>>   - Remove these directories, they contained the old pixel
>> manipulation functions
>>
>>   config:
>>   - Remove GimpBaseConfig, add GimpGeglConfig
>>   - Add config options for new features
>>
>>   core:
>>   - Add some things that used to live in base/, like the temp-buf,
>> boundary and histogram code
>>   - Port all functions to GEGL and higher bit depths
>>   - Keep the image around as GEGL graph, all other compositing is gone
>>   - Add non-destructive drawable filters, but use them only for
>> previews
>>   - Implement the floating selection as drawable filter
>>   - Implement GimpImageMap using drawable filters
>>   - Move batch processing to gimp-batch.[ch]
>>   - Run batch commands in an already running GIMP instance
>>   - Ported almost everything from filenames/FILE/fd to GFile/GIO
>>   - Be smarter about migrating old user config files
>>   - Move many object struct members to private structs
>>
>>   file:
>>   - Support GIO-ported file load/save procs, handle remote files
>> generically
>>
>>   - Add content locking to items to prevent them from being edited
>>   - Add position locking to items to prevent them from being translated
>>   - Implement all color management in the core
>>   - Add an automatic palette of recently used colors
>>   - Implement metadata handling in the core
>>
>>   gegl:
>>   - Now contains utility functions and abstractions to work with
>> GEGL more easily
>>   - Move all operations to the new operations/ directory
>>
>>   operations:
>>   - New directory containing all GIMP-internal GEGL operations
>> and their config objects (if any)
>>   - Add a correct version of the overlay layer mode
>>   - Add LCH layer modes
>>
>>   paint:
>>   - Port all paint cores to Gegl
>>   - Add MyPaint brush paint core
>>
>>   pdb:
>>   - Add compat procedures that work like the removed plug-ins
>>   - Use the new GimpValueArray, GValueArray got deprecated
>>
>>   plug-in:
>>   - Allow plug-ins to access image data at full bit depth
>>   - Add a compat mode so unported plug-ins always get 8-bit data
>>
>>   text:
>>   - Port text rendering to GEGL
>>   - Use HarfBuzz to inspect fonts for creating an example string
>>
>>   xcf:
>>   - Add zlib compression to XCF loading/saving
>>
>>
>> GUI:
>>
>>   - Add GUI to handle the new high bit depths and conversion between
>> them
>>   - Add new action group "filters" which can run arbitrary GEGL ops
>>   - Add lots of 

[Gimp-user] How do I get right menu back?

[powergal]

How do I get right menu back in gimp 2.8.16? I made a mistake in anchoring and
noticed no picture in right menu. I exited the program, started it up again,
and no right menu.  HELP

-- 
powergal (via www.gimpusers.com/forums)
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