Re: camera raw and input profiles
Re: camera raw and input profiles
- Subject: Re: camera raw and input profiles
- From: bruce fraser <email@hidden>
- Date: Fri, 25 Mar 2005 08:07:27 -0800
Raw files are grayscale images-the color only happens after demosaicing.
Cameras don't fit the ICC profile model well, because ICC profiles
expect the device they're profiling to have a fixed gamut. Cameras
don't. (Neither do scanners, but the film and reflective copy we scan
does, so with scanners it's a moot point.)
You don't want or need to see the unaltered raw data-it would be a
grayscale image that was mostly almost black. You want a tool that
converts that data into a color image that resembled the scene, while
still allowing all the freedom over white balance and tone mapping
that raw offers.
What Camera Raw does is to use two built-in profiles for each
camera-one for D65, the other for Illuminant A. The temperature and
tint controls interpolate between or extrapolate beyond those two
profiles.
The profiles you choose in Camera Raw govern the output space for the
raw conversion. They aren't applied to the raw data, nor could they
be (since it isn't color data to start with).
--
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