For RGB and indexed color files we do:
convert -render -layers merge "input file"  -black-point-compensation - 
intent Relative -profile "sRGB Color Space Profile.icm" -profile  
"USWebCoatedSWOP.icc" "output.tiff"

For CMYK files we do:
convert -render -layers merge "input file"  -black-point-compensation - 
intent Relative -profile "USWebCoatedSWOP.icc" "output.tiff"

For Grayscale files we do:
convert -render -layers merge "input file"  -black-point-compensation - 
intent Relative -profile "Gray Tone.icc" -profile  
"USWebCoatedSWOP.icc" "output.tiff"


On Apr 28, 2010, at 12:27 PM, Kai-Uwe Behrmann wrote:

> You did not tell us which profiles and options where involved.
>
> Am 28.04.10, 11:58 -0700 schrieb Drew Kutcharian:
>> We are using lcms 1.19 with Image Magick 6.6.1-5 on Linux and we love
>> it. It's a great little library.
>>
>> The only issue is we see some minor color variations when converting
>> images to CMYK. Basically, the images that we convert using
>> ImageMagick/LCMS are 10% darker than they would be if converted using
>> Photoshop.


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