> afeter looking at your PDF file, I think your problem is that the blue
> colors in the PDF file are specified in DeviceCMYK color space.
> Therefore the results will look different, if you send them to different
> output devices. DeviceRGB and DeviceCMYK colors in PostScript are
> basically not subject to color managent, but are interpreted as native
> device colors of the output device used. Acrobat Reader on the other
> hand seems to remap DeviceCMYK somehow, but appearently only, if the PDF
> file is displayed on the screen, but it also not when it is printed to a
> PostScript file - the PostScript file again contains the blue color
> specified in DeviceCMYK color space. It definitely looks like Acrobat
> Reader does remap the DeviceCMYK color differently than the DeviceCMYK
> -> DeviceRGB conversion specified in the PostScript Language Reference
> Manual (PLRM). I am pretty confident that gs will simply honor the
> formula specified in the PLMR (if you haven't remapped DeviceCMYK to a
> CIE based color space), but I don't know which CMYK color space Acrobat
> Reader assumes for displaying DeviceCMYK values on the screen.
>
Thanks Gerhard for your comments. But what I want to do is to make
the preview match the look in Acrobat since customers will not be sure
what colors they will get from printer when they order online. That's why
I am thinking of applying a profile to the preview to get a match with
Acrobat. It seems this is not an easy assignment.
--
With regards
Phillip Pan
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