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1. Re: CMYK gradient maps don't work correctly in Photoshop CS 4
thebestcpu Nov 16, 2009 1:24 PM (in response to dreadcat)I have not gone back to check how this is handled in CS3 yet I could duplicate your problem in CS4. The changing of numbers in the CMYK looks like it has to do with the color mangement settings in Photoshop.
I was able to make sure the numbers input to the gradient map did not chang. I did this by going to Edit>Assign Profile and then clicked the option "Don't Color Manage this Document"
This may not solve your problem directly yet it does indicate that the problem you have (or that Adobe has) is related to how the color management is being handled.
So one question would be are you using the "exact" color management settings in CS4 as you did in CS3 and were those in place when you imported the file into CS4. If not, and if you did not have the correct warning options set, there may have been a color setting change of which you were not aware.
While I was able to keep the original settings from changing in the Gradient Map, there was still a problem in CS4 where the Lab values would change (and the appearance on the LCD screen) after doing any color picker editing and changing the CMYK values back to 40 20 20 100. This definetly seems related to the color model/probile/management system in place. So it appears that even though I can get the CMYK numbers to stay and not change, there is still a bug when making no changes to the color management settings, and the CMYK values are the same, that the Lab values and the appearance on the screen change.
Hope you can get Adobe's attention. Looks like a bug to me.

