Re: [Gimp-user] Printing Color Managment

[Alexandre Prokoudine]

On Sat, Feb 16, 2013 at 4:22 PM, Alexandre Prokoudine wrote:

 If this is about the Gutenprint plug-in, then any wrongdoings are most
 likely on its side.

Actually, after another reading of the original mail I think I made a
rush judgement. It's quite possible that GIMP is sending incorrect
data to the printing plug-in. I'm not sure if Elle looked at this part
of the color management implementation in GIMP during her work last
year. If that's indeed what's happening, it would be great to fix this
in 2.10.

Alexandre Prokoudine
http://libregraphicsworld.org
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Re: [Gimp-user] Printing Color Managment

[Jehan Pagès]

Hi,

On Fri, Feb 15, 2013 at 1:45 AM, Lowell PBS4U pb...@hotmail.com wrote:

 On the Argyllcms list Gerhard Fuernkranz wrote
  “Btw, regarding gimp, I remember that in the past old versions of the
 gimp print plug-in did fiddle with the colorsduring printing,
 i.e. the DeviceRGB numbers sent to the printer did not match the RGB
 numbers in gimp's working space. I don't know, however, whether this still
 applies to recent versions.”


 So I thought I'd answer this question, with your help. Does Gimp still
 “fiddle with the colors during printing”?


Actually I think the problem you are refering to is more that printers do
not use RGB at all. The most common color space for printers is CMYK:
http://en.wikipedia.org/wiki/CMYK_color_model
RGB on the other hand is done for screen display. And so the answer is that
unfortunately there is still no CMYK support in GIMP. You can't create a
CMYK image in GIMP. This means that when you send the RGB image to your
printer, a conversion is done to the other color space, but this conversion
is not perfect (basically the result will change with the material).

So that means that GIMP is good for all work made to stay on screen (web,
animation, video, etc.), but less for printed work.

Note that for printed work, even if you have a software with CMYK support,
your screen is still RGB (so now the conversion is done on display, same
problem), and if your printer is not well calibrated, it may still be
different from what a professional printer will print. That means that
having CMYK support is a start, but that is only one single link in a
bigger chain of failure.
That also means that it is a problematic for professionals designers or
alike, who will also afford additional material and/or effort to calibrate
their screen, scanner, printer, etc. For most basic users, this support is
not as useful in reality as most people have badly calibrated material.

But yes, that would still be good when GIMP will support CMYK.

Jehan

pb...@hotmail.com

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[Gimp-user] Printing Color Managment

[Lowell PBS4U]

On the Argyllcms list Gerhard
Fuernkranz wrote
 “Btw, regarding gimp, I remember that in the past
old versions of the gimp print plug-in did fiddle with the colors   
during printing, i.e. the DeviceRGB numbers sent to the printer did
not match the RGB numbers in gimp's working space. I don't know,
however, whether this still applies to recent versions.”

So I thought I'd answer this
question, with your help. Does Gimp still “fiddle with the colors
during printing”?


pb...@hotmail.com ___
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