Erroneous color transformations with Apple CMM
Erroneous color transformations with Apple CMM
- Subject: Erroneous color transformations with Apple CMM
- From: Klaus Karcher <email@hidden>
- Date: Tue, 26 Jan 2010 09:22:28 +0100
- Delivered-to: email@hidden
- Delivered-to: email@hidden
- User-agent: Thunderbird 2.0.0.23 (Macintosh/20090812)
Hi,
I guess I come across a long-standing, IMHO really serious bug in Apples
ColorSync API again.
When you open the image
<http://digitalproof.info/colorsync-users/AppleCMM_bug/CMMtest-source.tif>
in Preview or Quick Look, you see pink clouds.
When you open it in Photoshop and use the default Adobe ACE CMM to
display or convert the image e.g. to sRGB, the clouds are gray and stay
gray.
When you use the AppleCMM (in Photoshop or anywhere else) to convert or
display the image, the clouds turn pink again.
see also the converted results (re. col. w/o BPC to sRGB):
Adobe ACE:
<http://digitalproof.info/colorsync-users/AppleCMM_bug/CMMtest-Adobe_ACE.jpg>
ArgyllCMS:
<http://digitalproof.info/colorsync-users/AppleCMM_bug/CMMtest-ArgyllCMS.jpg>
AppleCMM:
<http://digitalproof.info/colorsync-users/AppleCMM_bug/CMMtest-AppleCMM.jpg>
I know that the embedded profile in the source image is fairly off-key
and the image is over-exposed, but that's not the point.
see also my old post in the colorsync developer list for more backgroud
information.
<http://lists.apple.com/archives/Colorsync-dev/2008/Dec/msg00001.html>
<http://lists.apple.com/archives/Colorsync-dev/2008/Dec/msg00002.html>
unfortunately nobody responded to it at that time.
As I think it's really a fatal bug that disqualifies Apples CMM for
serious color work, I feel obliged to harp on this issue.
I'll also submit a bug reports to Apple.
Klaus
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