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RGB to CMYK problems

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RGB to CMYK problems

Postby jee on Tue Jul 17, 2007 9:41 pm

Hi. I've recently upgraded from photoshop9 to CS2.
Ever since than, I cannot see the color shift after converting from RGB to CMYK. I've tried calibrating the monitor and using different ICC profiles and it didn't work.

I cannot edit color at all since before and after converting ot CMYK looks the same.

I really need to be able to see the color shift in order to edit colors before sending them to press.

Any Ideas?
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Postby Medley on Tue Jul 17, 2007 10:22 pm

Here's a neat trick that makes it a lot easier for me when I'm converting colors:

In your RGB image, go to Select> Color Range. All the way at the bottom of the drop-down menu is a choice called "out-of-gamut". This selects all the pixels that don't conform to your CYMK prefrences. Next, hide the selection (Cmd/Ctrl-H). Now go to View> Gamut Warning.

Now, you've not only selected all the pixels that are out of gamut, but they've turned grey as well. Very easy to see. Now go ahead and use your favorite editing method. As the colors come into CYMK's color range, the pixels will change from grey to color.

When you have only a few sporadic grey pixels left, go to Image>Mode> CYMK and force them into gamut.

This probably wasn't the answer you were looking for, but once you get used to it, it's an awesome way to control your CYMK color conversions. Hope it helps you.

- Joe U.
There are only 10 types of people in this world- those who understand binary, and those who don't.
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Postby kyockxzsnt on Wed Jul 18, 2007 1:09 am

Try reducing your ink limit. Go to Edit> Color Settings> then customize the CMYK Working Spaces> reduce the Total Ink Limit (My press profile only uses 235). This is only an option if you are not using a particular ICC Profile.
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