[argyllcms] Re: Capture One Profiles
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Mon, 08 Jul 2013 11:50:00 +1000
Maciej Bryński wrote:
> Graeme,
> Have you thought about adding option to calculate profile without WB shift ?
There's already an option for this - use absolute intent. You probably want to
use -u when building the profile to avoid clipping above the default
white point.
In theory the correct workflow is:
Convert camera RAW RGB -> absolute XYZ using the profile.
Choose or compute a white point/exposure
Transform to white point relative using a suitable Chromatic adaptation, such
as the Bradford matrix.
(optional) convert from relative XYZ to your working RGB space.
Pretty simple & basic stuff from a color science point of view. I suspect from
the discussion that few photo processing systems actually work this way ?
Certainly the default relative ICC workflows have a baked in white point,
but absolute intent bypasses this.
Graeme Gill.
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