RE: [PyMOL] rgb to cmyk woes

[Warren D. <wa...@de...>]

Roger,

CMYK and RGB are non-equivalent, and there will always be some mangling like
what you describe.  The CMYK color mode in PyMOL is an attempt to constrain
PyMOL to using the a subset of RGB values that can be mapped reliably into
the CMYK color space, at least via Photoshop.  It's not a perfect solution,
but it usually gives better results than trying to convert normal RGB
images.  

The best advice I can offer is to try changing the PyMOL colors slightly,
and to then use the color adjustments in Photoshop to fix the image as best
you can.

Cheers,
Warren

--
mailto:wa...@de...
Warren L. DeLano, Ph.D.
Principal Scientist
DeLano Scientific LLC
Voice (650)-346-1154 
Fax   (650)-593-4020
  

> -----Original Message-----
> From: pym...@li... 
> [mailto:pym...@li...] On Behalf Of 
> Roger Dodd
> Sent: Thursday, September 16, 2004 4:23 AM
> To: pym...@li...
> Subject: [PyMOL] rgb to cmyk woes
> 
> Hi all,
> 
> I'm trying to prepare some figures for publication and of 
> course the journal requires them in cmyk format. I have 
> produced the images in pymol using the cmyk color space and 
> saved them as png files. However, the png files themselves 
> are in 24 bit rgb format if I'm correct. Trying to 
> subsequently convert them to cmyk format tiff files in 
> photoshop or coreldraw results in all the colors being 
> mangled (becoming duller and darker). Is there some trick to 
> converting to the cmyk color space without altering the 
> colors - I assumed working in the cmyk mode in PyMOL would 
> ensure this didn't occur?
> 
> Thanks in advance for any help
> 
> Roger Dodd
> 
> 
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