[magick-users] Questions on CMYK to RGB and RGB to CMYK conversion

[Simon]

Hello MailingList!


I have some questions on CMYK to RGB conversion an vice versa.
Already read a little about it and I know that there will be
a loss of quality when convertig between the colorspaces...

I'm using Linux and ImageMagick 6.2.4

That's how I tried to convert images:



convert -profile RGB_PROFILE RGB_IMAGE.jpg -profile CMYK_PROFILE
CMYK_RESULTIMAGE.jpg


I tried different combinations of the Adobe ICC profiles but did't come
up with results that were okay...



1. Is there a way to do this WITHOUT profiles?
I tried changing the Colorspace, but when I convert from
RGB to CMYK the result is very dark.



2. Why do I need TWO profiles?
I tried to use one profile for the CMYK resultfile in a RGB to CMYK
conversion, but the resulting image still had RGB colorspace
(convert RGB_IMAGE -profile CMYK_PROFILE CMYK_RESULTIMAGE)



3. Which RGB profile is best for converting FROM RGB into a CMYK profile?
I tried almost every combination with the Adobe RGB and CMYK ICCs, but
the result is always very blue-ish. In some examples I found people were
using a profile called sRGB.icc. is that the adobe "sRGB Color Space
Profile.icm"?


I'm happy and thankful for every hint/tip/suggestions that might give me
better results :)


So long,
#Simon