On Sat, 21 May 2005, Graeme Gill wrote:
I'm not following that line of thought. Usually clipping is
a problem at the destination profile, due to real device
gamut limits. XYZ PCS certainly has a much greater range than
Lab PCS, but how many input profiles are going to have a gamut
that exceeds the Lab PCS ?
All it takes is one. :-)
Kai-Uwe's experiments are with image data which is log encoded to
represent a density range of up to (typically) 2.048. This is a
common representation for motion picture film images.
Up until now, it seems that the film industry has been soundly
ignoring ICC CMS and has instead implemented many proprietary methods
for performing color adjustments on film images. This is in spite of
the fact that color adjustments (a.k.a "grading") are done for every
film and it plays a significant role in the production of each movie.
The necessary color adjustments may be different for a different reel
of film, different scene., etc.
Accurately preserving/presenting "above white" information is quite
important to the film people since film itself is able to support it
and people can see the difference.
Bob
======================================
Bob Friesenhahn
[EMAIL PROTECTED], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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