[magick-users] convert RGB to CMYK

[John Culleton]

I need to convert a jpg file (e.g., photo) or png file from RGB to 
CMYK color model. All the examples seem to go the other way. What is 
an example string I can use as a model?  I have an example that uses 
pnmtotiffcmyk as well as ImageMagick but I hope to do the conversion 
without an additional program.

-- 
John Culleton
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