I'm the OP'er...since I'm a network tech and not a graphic designer I want
to make sure I understand what I'm getting from these posts before I go back
to the designer. When you wrote, "...will need to understand its limitations
for photos  destined for print jobs and develop workarounds"

Does that mean that there is no fix? Or is the fix to convert the visible
image to cmyk in the Gimp so the designer can adjust colors, etc so the
print should match the screen? 

I've been using the Gimp in a limited capacity for the past 4 years and I
love it. I like to promote it as much as possible.

Rob Ogle, MCSE
Computer Server Solutions, inc

-----Original Message-----
[mailto:[EMAIL PROTECTED] On Behalf Of John R.
Sent: Thursday, September 28, 2006 8:07 AM
To: Øyvind Kolås
Subject: Re: [Gimp-user] Color Printing

On Wednesday 27 September 2006 18:03, Øyvind Kolås wrote:
> Color management support is improved in the latest development 
> versions of GIMP, this is not the same as editing in CMYK mode, but it 
> should be the thing more than 90% of the people asking for CMYK needs, 
> even though they think it is not.
> It is sufficient to do the conversion to CMYK when exporting from GIMP 
> to file/the printer to achieve correct colors if you have a color 
> correction profile for your display as well as your printer. This is a 
> separate issue from being able to work with the image in CMYK mode.
> Manipulating a photograph in CMYK mode is in most cases mostly 
> pointless since the source of the data is the RGB model and the human 
> visual system operates in RGB as well. The separation needed for CMYK 
> varies between printers whilst sRGB is a standard color space for 
> image exchange.
> /Øyvind K.

Welll perception is everything. It is necessary for Gimp not to be as good
as but better than its competition to gain acceptance. As soon as the CMYK
lack is mentioned people in my industry are turned off and won't consider
the product further. 

The product of professional print designers today is not separations or an
sRGB file but a PDF or tiff file in CMYK model.
Prepress, making of separations etc. is a separate process. If conversion is
done at the end of the designer's workflow then there is no chance to put
back the brightness that is lost.

But there is perhaps a way to do it. If a display function can be added to
Gimp whereby a double conversion is done, from RGB to CMYK and back again,
then the user could view the illo in Gimp with the gamut limited to what it
will be in CMYK model, and adjust saturation etc. to bring the photo back up
to requirements. Since there is already a function to separate into CMYK
colors it could possibly be a recombination of those separations into a
single image.  

In the meantime people like the OP who want to use Gimp instead of Photoshop
in their workflow will need to understand its limitations for photos
destined for print jobs and develop workarounds. We need to be honest about
this up front.  

John Culleton
Able Indexing and Typesetting
Precision typesetting (tm) at reasonable cost.
Satisfaction guaranteed.

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