untagged RGB data
untagged RGB data
- Subject: untagged RGB data
- From: John Zimmerer <email@hidden>
- Date: Thu, 18 Dec 2003 18:29:50 -0800
All,
Untagged RGB data is treated differently when drawn to the display than
when saving as PDF or printing in Panther.
Untagged RGB data is (currently) not matched to the display. This is
done mainly for performance reasons. If the data wasn't worth tagging,
the assumption was it's not worth the overhead to the user to have all
untagged RGB data matched to the main display profile. NOTE: untagged
CMYK data is matched to the display using the Generic CMYK Profile.icc
as source, and untagged gray data is matched to the display using
Generic Gray Profile.icc as source.
The mantra since v10.0 has been "tag your data", so the OS knows for
sure how to treat it.
We're at a point now that most hardware, particularly Quartz Extreme
capable display cards, can be used to help speed the color matching. We
can now consider matching untagged data by default. The question
remaining would be whether to assume Generic RGB or sRGB as the source
for all untagged RGB data, and/or to have Quartz look to the ColorSync
prefs for this info. I'm interested in this part of the discussion.
JZ
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