Am 20.03.12, 21:17 +0100 schrieb Thomas Lübking:
Am 20.03.2012, 20:12 Uhr, schrieb Martin Graesslin <[email protected]>:
A fully color corrected compositor seems feasible to me
I'm atm. not even sure about that.
I might be utterly wrong, but my impression is that the xvidmode extension
can correct screens (eg. xcalib loads icc profiles), so a screen wide color
xvidmode gamma ramps are per channel curves. These are very limited
compared to ICC based colour correction. Those gamma curves provide better
gray balance and potentialy white point adjustment. But they do not
describe colour primaries shifts or other more complex distortions. Gamma
curves must be taken into account for ICC profiles. But detailed
characterisation of device colorimetry happens usualy in ICC profiles.
correcting compositor would be only required to fix multiscreen (not
multihead) setups which i frankly consider no case either, because a full
correction would just mean to restrict the WG screen to the SRGB one
The X Color Management spec requires per window colour correction for base
line implementations. Thus it is possible to specify an source space other
than sRGB.
(yesno?!), what doesn't much sound like a great achievement to me (and is
simply no case in at least the professional context. You don't purchase _one_
WG screen to use it -restricted- alongside your SRGB screen, but just
purchase two WG screens and give away the SRGB one to one of your employees
at home or whatever)
exactly. Thats why opting out of colour management and being able to
specify a intermediate colour profile is a good thing.
Cheers,
Thomas
kind regards
Kai-Uwe
