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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