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RelCol vs AbsCol, v2 vs v4, was: Chris Murphy vs Bruce Fraser



Test image:
RGB, Source = sRGB IEC61966-2.1
Filled with white space, small selection filled with RGB 0,0,255

Convert to Destination= U.S. Web Coated (SWOP) v2


1. Photoshop CS using RelCol + BPC White: 0,0,0,0 Blue: 88,77,0,0

2. Photoshop CS using AbsCol
White 5,1,0,0
Blue: 93,72,0,0

3. Photoshop CS2 using RelColr + BPC
White: 0,0,0,0
Blue: 88,77,0,0

4. Photoshop CS2 using AbsCol
White: 1,0,0,0
Blue: 92,72,0,0

5. Mac OS X 10.4.7 AppleScript using same profiles as above, RelCol
White: 0,0,0,0
Blue:93,79,0,0

6. Mac OS X 10.4.7 AppleScript using same profiles as above, AbsCol
White:5,1,0,0
Blue:94,72,0,0

7. Mac OS X 10.4.7 AppleScript using a candidate ICC v4 sRGB as source, RelCol
White:0,0,0,0
Blue:90,78,0,0


8. Mac OS X 10.4.7 AppleScript using a candidate ICC v4 sRGB as source, AbsCol
White:0,0,0,0
Blue:90,71,0,0


In all cases there is a difference between RelCol and AbsCol. The "scum dot" of 1% cyan in #4 I think is a bug. Photoshop CS2 is in effect treating v2 display profiles as though they are v4 display profiles with respect to the wtpt tag.


Chris Murphy Color Remedies (TM) www.colorremedies.com/realworldcolor --------------------------------------------------------- Co-author "Real World Color Management, 2nd Ed" Published by PeachPit Press (ISBN 0-321-26722-2)

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References: 
 >Chris Murphy vs Bruce Fraser (From: Mauro Boscarol <email@hidden>)
 >Re: Chris Murphy vs Bruce Fraser (From: Chris Murphy <email@hidden>)
 >Re: Chris Murphy vs Bruce Fraser (From: Graeme Gill <email@hidden>)
 >Re: Chris Murphy vs Bruce Fraser (From: Chris Murphy <email@hidden>)
 >Re: Chris Murphy vs Bruce Fraser (From: Graeme Gill <email@hidden>)
 >Re: Chris Murphy vs Bruce Fraser (From: Chris Murphy <email@hidden>)
 >Re: Chris Murphy vs Bruce Fraser (From: Graeme Gill <email@hidden>)
 >Re: Chris Murphy vs Bruce Fraser (From: Steve Upton <email@hidden>)
 >Re: Chris Murphy vs Bruce Fraser (From: Chris Murphy <email@hidden>)



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