Re: Media Testing for maclife.de
Re: Media Testing for maclife.de
- Subject: Re: Media Testing for maclife.de
- From: Graeme Gill <email@hidden>
- Date: Mon, 08 Sep 2008 22:11:10 +1000
Bob Frost wrote:
"First, ICC camera profiles used by raw converters today are designed to
process output-referred (i.e., rendered) image data, not scene-referred
(i.e., raw) image data. Furthermore, the sequence and placement of color
transformations described in an ICC camera profile can prevent other image
processing stages (such as highlight recovery algorithms) from performing
optimally.
Not strictly true as I understand it. While this is typical ICC profile
usage, the existing format can be adapted to other situations (I've
seen some sketches on how this can be done from some of the camera folks),
and the floating point tags introduced with the latest revisions are
pretty much targeted at input referred image capture.
Third, there is no standard that describes the input color space
of the ICC camera profile color transformation (it is often, but not
always,
a tone-mapped set of RGB camera coordinates). Consequently, ICC camera
profiles are not portable: they can only be used with the raw converter for
which they were explicitly created in the first place. Using an ICC camera
profile designed for one raw converter with another raw converter nearly
always produces incorrect (though sometimes entertaining) results."
This criticism doesn't really seem relevant, since it applies equally
to the Adobe approach. Of course with the Adobe profiles, one doesn't
actually have the option of using them with other raw capture software...
Graeme Gill.
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