Clipping [was: Can DeviceLink conversions be better?]
Clipping [was: Can DeviceLink conversions be better?]
- Subject: Clipping [was: Can DeviceLink conversions be better?]
- From: Klaus Karcher <email@hidden>
- Date: Sat, 06 Sep 2008 12:48:55 +0200
Marco Ugolini wrote:
I fail to see the relevance of this to my comment on Rolf's device link
test. What I can see on my monitor looks better in the image converted
with
the device link profile. My comment was limited to just that, and
obviously
didn't claim to apply to that which my monitor in not capable of
displaying.
Klaus Karcher wrote:
This does not make much sense to me: when one aims to prove the
capabilities of optimized device links for a certain device, one should
use that device or at least one that is capable to represent the whole
gamut of that device smoothly and clipping-free IMHO -- otherwise the
results are less conclusive.
I don't want to overstretch this topic, but use this opportunity to
explain some details to those below Marco's level of knowledge.
From a mathematical point of view, what one sees on a monitor with a
matrix profile when the colors are out of gamut is a projection onto the
monitor's gamut surface. Projections can be very delusive, as
illustrated e.g. on this page:
<http://www.hemmy.net/2007/06/17/shadow-illusions/>. What makes things
even more complicated is the fact than the projection takes place in a
distorted space onto curved and bend surfaces.
As much of the interesting stuff in Rolf's test image takes place in
very colorful regions (i.e. intensive greens, yellows and reds), there
is probably not much of significance left to assess reliably. See also
<http://digitalproof.info/colorsync-users/DLtest_gamut.png>: The
transparent body depicts the source image gamut, the bright one inside
is after applying the device link profile and the blue one is the
(admittedly small) gamut surface of a MacBook Pro display.
Have a nice weekend,
Klaus
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