Re: what cmm should I use in PS 6.0
Re: what cmm should I use in PS 6.0
- Subject: Re: what cmm should I use in PS 6.0
- From: Terry Wyse <email@hidden>
- Date: Tue, 05 Jun 2001 09:36:34 -0400
I guess I should've clarified. I was assuming relative colorimetric where
"white" should be "white". What you described below is correct because
you're using absolute colorimetric which will incorporate "paper white" into
the image, hence the conversion of RGB 255/255/255 to 4% yellow. This is
perfectly normal. If in fact the "Apple CMMs do not have this problem" then
they are wrong because they SHOULD be incorporating the paper white (1%m
4%y?).
So what I stated was true assuming RelCol rendering. I've also found that
this issue can be affected by the application used to create the profile as
well as the CMM used.
Terry
on 6/4/01 3:33 AM, Martin [apple account] wrote:
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on Sun, 03 Jun 2001 21:37:17 -0400, Terry Wyse <email@hidden>
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wrote:
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> The Adobe (ACE) CMM seems to be the most reliable. Don't know about the
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> Apple CMM but the Heidleberg CMM could leave scum dots in the pure whites
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> whereas the Adobe CMM doesn't seem to have this problem.
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This is untrue.
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If you create a new, white background, RGB document in PS 6.0.1 using:
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1. Ekta as your RGB working space
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2. Euroscale Coated V2 as your CMYK working space
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3. Absolute Colorimetric as you rendering intent
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4. Adobe (ACE) as your CMM
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Drag your cursor over the white and you can see that your info dialogue
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shows a c=0! m-1! y=4! k=0! separation for 255/255/255
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Using Heidelberg CMM removes the 1% magenta but retains the 4% yellow.
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Neither of the Apple CMMs have this problem.