Re: Camera profiling with ICC et al
Re: Camera profiling with ICC et al
- Subject: Re: Camera profiling with ICC et al
- From: Uli Zappe <email@hidden>
- Date: Tue, 16 Sep 2008 02:16:40 +0200
Am 16.09.2008 um 01:46 schrieb MARK SEGAL:
Some of today's emails have really been very informative, and I'm
beginning to wonder based on what I'm reading whether chasing after
"accurate" profiles may be akin to nailing jelly to a wall.
I feel your pain.
While I feel I was reasonably complete with my metrological testing
within the chosen methodology and the usual constraints of
reality ;-) , my experience with real scenes is much more anecdotal.
Yes, I looked at more than a thousand test images, but those were
actually only 8 images, with ~125 different profiles assigned or
rendered by different RAW converters, and anyway, visual evaluation is
an infinite undertaking.
Still, I can honestly say that I clearly visually preferred the test
images with the best of my custom built profiles to those with factory
profiles from the different RAW converters. Canon Faithful (or Adobe's
emulation of it) came closest, but the custom profiles were still
better, and this was especially true for skin colors.
OTOH, if I decided to use my best custom built profile on a regular
basis, I'm sure I'd live in constant fear that just the next image I'd
shoot would contain an evil metamerism that would ruin my image (of
course, I could always switch the profile). So it's certainly worth
considering to e.g. go with Canon Faithful for results that are a
little worse, but give you peace of mind. :-) Then again, if I wanted
the best I could get, I would currently surely use the best of my
custom built profiles.
If there's so much difference between the spectral response of alot
of real world subject matter one photographs and that of the targets
one uses for profiling, it isn't entirely clear - unfortunately -
that your otherwise logical inference (last sentence) would
necessarily hold in practice, much as one may be attracted to a
"correct according to the target" colorimetric approach.
Logic is swirling in my head right now, but this might as well be as
result of this list discussion. ;-)
Uli, isn't the issue here not really the colour of patch and the
skin matching, but rather the fact that the materials - skin and SG
colour patches - are not the same and may respond differently to
light, so they turn out to be not equivalent in respect of colour
rendition?
As I just said, I personally was pleased by the achievable results,
but in any case, the quote from X-Rite's web site I just posted
maintains that the SG color patches emulate skin in its spectral
response, too.
Bye
Uli
________________________________________________________
Uli Zappe, Solmsstraße 5, D-65189 Wiesbaden, Germany
http://www.ritual.org
Fon: +49-700-ULIZAPPE
Fax: +49-700-ZAPPEFAX
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