> CSA stands for "Color Space Array". A CSA defines a CIE based color
> space, it is more or less the postscript equivalent to an ICC profile.
> The postscript file I sent you, basically defines a CSA for the SWOP
> color space, and additionally remaps DeviceCMYK colors to this CIE based
> color space. While this remapping appears to work as expected for the
> DeviceCMYK colors used in your first PDF file, appearently it does not
> work with your 2nd PDF file. The major difference is, that your 2nd PDF
> file uses "separation" color spaces for all colors. If I remember
> correctly, gs > version 8.0 is required for the full support of spot
> colors and separations, and I only have version 7.05. Maybe unsing a
> recent gs version (8.11) may solve this problem, but of course I don't
> know for sure.
Thanks Gerhard for trying it out and explain to me the syntax in
color management. Did you try the 1st PDF in gs 8? Does it look closer to
Acrobat display? If so, I think I need to upgrade to ghostscript 8. But I
heard that gs 8 was not as stable as 7 at this stage.
Another workaround to this problem is to transform the preview to
CMYK using USSwopCMYK.icc as output profile and transform the preview back
using the same profile as input profile. This seems to do the
trick. However, this need some changes in jpegicc.c file. I did some
testing and the result seems to be promising.
If you are interested, I can send you the C file.
--
With regards
Phillip Pan
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