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How to convert from RGB to CMYK

Feb 25, 2011, 17:39 (This post was last modified: Feb 25, 2011 17:48 by deepla.)
Post: #1
How to convert from RGB to CMYK
Hi i am having a Tiff image in RGB which needs to be converted to CMYK. How do I do it? Without loosing the dpi.

Also my publisher is complaining that the image has an alpha channel and has to be removed. How do I do both these ?

Thanks in advance
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Feb 25, 2011, 22:10
Post: #2
RE: How to convert from RGB to CMYK
To convert to CYMK, your best solution is to use ImageMagick:

http://www.imagemagick.org/discourse-ser...f=1&t=9227

It looks complicated but to do it properly in Gimp would be even more so.

To remove the alpha channel, flatten the image and remove the alpha channel from the remaining layer. ImageMagick may also have a way to do it.

As much as I love Gimp, there is a good deal of rather standard processing and conversion that ImageMagick will do better and faster. Yes it's a command line utility, and yes, the doc is a long read, but this is only a consequence of its extreme functional richness. And putting the full command in a .bat is the best way to remember how to do it a second time, this a lot easier and more practical tan remembering all the mousing in GIMP.

Now answering your questions on
https://Gimp-Forum.net
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Feb 26, 2011, 06:54
Post: #3
RE: How to convert from RGB to CMYK
Thanks Ofnuts for your reply. Command line is not my cup. Anyway I could do it easily with photoshop trial version I downloaded. Thanks for helping.
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