Could you please post a screenshot with the pertinent Panels visible?
What is the Blend Mode of the Gradient Map Layer?
I can’t make it out in the screenshot and you mentioned in the original post that you work in CMYK – but are you sure the file is not RGB (or Lab)?
That’s the first possible reason that comes to my mind for the issue.
No definitely not. I've tried across different documents, untagged CMYK and tagged FORGA39. I've even converted to greyscale and then back to CMYK just to see if it helps - it doesn't.
Smoothness set to 0 doesn't help either.
Its not a total ink problem as it's adding 1% M and 1% Y to the light stop as well (it should be 70%C only).
My take is that you are simply seeing the lossy conversion between CMYK and RGB. The values in the color picker appear to be fundamentally RGB based.
If I check the gradient color stops in the color picker by reopening the gradient dialog immediately after creating the gradient the CMYK values are preserved. If, however, I do any other operation, say click on the base layer, and then open the gradient, the values have changed. So it appears that once the gradient is incorporated into the work flow the CMYK - RGB conversions take place giving the results you see.
I tested a CMYK-file with a Gradient Map and the Color Stops maintained their CMYK-values even after re-opening the file.
Which CMYK values did you use ?
I see the same as c.p. No change, even after close and reopen, and the yellow channel is 0% all the way (I used the same exact values as davetwo).
Davetwo, do you also have FOGRA39 as your CMYK working space? I believe the color picker will use that as reference for the actual numbers. I tried with ISO Coated, which is also my working space.
I've just tried the same process at home with CS3 and CS5 and the colour stick just fine. So either its some setting in the gradient map adjustment engine in my work mac or its a CS4 issue?
Docs are definitely CMYK for the colour values please see the above screengrab.
Also workspace and profiles are synchronised to be FOGRA39. And the issue HAS been replicated on another machine at work. I'm not using the same set of images - I've tried it out on a random set of files too.
It certainly feels like the Gradient Map is using RGB values and converting them, but why? I'm not using the picker, I'm manually typing the vlues into the CMYK fields. FYI the radio button in the Gradient Map dialogue is in it's default piosition next to the 'H' of hsb.
I really am confused now.
I just did a check using Windows CS3 and I do not see the issue.
My initial response confirming your result was on Windows CS4.
So all I can conclude at the moment is that the issue is in CS4 and that the changes induced are the changes one gets in RGB - CMYK conversions.
That means that the RGB working space will play a part. If it's sRGB some of those blue colors will very likely be out of gamut.
Unless this is an obscure CS4 bug that has gone unnoticed.
Opened CS4, changed CS4 working spaces to sRGB and FOGRA39.
Closed and relaunched.
The numbers stay fixed. No way to make them change. It just doesn't happen.
Wait..I see it..but only with FOGRA39. With ISO Coated (eci) it doesn't happen.
Anyone care to offer any explanations - ? I don't...
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Just to confirm after some more testing:
CS4, FOGRA39 - numbers change
CS4, ISO Coated (ECI) - no change
CS5, FOGRA39 - no change
CS5, ISO Coated (ECI) - no change
So whether the problem is CS4 or the FOGRA profile is impossible to tell. I haven't had time to check any other profiles.
OK, so I'm back at work. Back on CS4.
I've reopened the file, converted it to FOGRA27 and reset the gradient. Numbers are still changing.
I've reopened the file, converted it to SWOP and reset the gradient. Numbers are still changing.
Taken the FOGRA 39 file and opened in CS5 and reset the gradient. Numbers stick!
So I've got to assume a bug within CS4.... Now what to do:(
Thanks for all the replies – maybe an Adobe Employee could shed some light.
Sorry, I had actually tested in CS5 without mentioning it.