Re: Media Testing for maclife.de
Re: Media Testing for maclife.de
- Subject: Re: Media Testing for maclife.de
- From: "Fleisher, Ken" <email@hidden>
- Date: Wed, 10 Sep 2008 07:46:46 -0400
- Thread-topic: Media Testing for maclife.de
Uli,
I think you are confused by what is being described to you. A single ICC
profile cannot account for multiple lighting conditions. In other words, if
a scene has more than one illuminant "simultaneously" lighting the scene in
varying amounts. What you describe, and tested, are multiple illuminants as
single sources in the scene (not simultaneous). This is not the same thing.
Another observation is that you are working on the assumption that a raw
converter's default settings are the manufacturer's best attempt at the
optimal settings. This an incorrect assumption for at least two reasons.
1) A raw converter must be capable of interpreting images from many
different situations. There simply is no "best" setting. The default
settings are generally just null values for each of the options (or
sometimes a general guess like a sharpening setting). This in no way implies
the appropriateness of the settings for any particular image. For the
"camera" profiles described that try to imitate the "look" of a particular
camera, it is a little more accurate to assume the settings have meaning,
but that meaning is in no way to imply number 2 (below).
2) The goal of all raw interpreters is to make pleasing images, not color
accurate ones. Therefore, even if the default settings were meant to create
the manufacturer's best attempt at the "correct" settings, the target of
these settings is a pleasing image, not a color accurate one (as Chris Cox
said about the Adobe products). So whether the CC24 patches hit their
targets or not is irrelevant.
Keep in mind that I am in favor of ICC profiles for camera profiling and
camera profiling is something that I work with daily. I too would like to
see the "option" of using the ICC route in a camera raw workflow. I merely
wanted to point out what I see as 1) a misunderstanding in language and 2) a
flaw in your premise from your experiments.
Ken
On 9/10/08 12:10 AM, "Uli Zappe" <email@hidden> wrote:
>> A single ICC profile cannot account for multiple lighting conditions
>> - that is one of the big, well known, well understood limitations of
>> ICC profiles.
>
> And wrong, as my measurements revealed (in the meaning I explained
> above).
>
> Of course, this result is remarkable, but the numbers are clear: my
> best ICC profile was better in *any single* lighting condition than
> e.g. Adobe's default profiles. See my upcoming report, where I will
> publish the numbers.
--
Ken Fleisher
Photographer
Imaging & Visual Services
National Gallery of Art
Washington, D.C.
Phone: (202) 712-7471
email@hidden
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