[GSoC] KWin colour management

Kai-Uwe Behrmann ku.b at gmx.de
Thu Mar 22 18:26:09 GMT 2012

Sorry I missed to answere you somehow.

Am 21.03.12, 10:25 +0100 schrieb todd rme:
> On Wed, Mar 21, 2012 at 8:39 AM, Kai-Uwe Behrmann <ku.b at gmx.de> wrote:
>> Am 20.03.12, 21:17 +0100 schrieb Thomas Lübking:
>>> Am 20.03.2012, 20:12 Uhr, schrieb Martin Graesslin <mgraesslin at kde.org>:
>>>> 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.
> This may be an ignorant question, but can xvidmode be extended to
> offer more complex correction?

That would end in a all desktop content is sRGB dituation. That would be 
fine as long as we know that wide gamut monitors are excluded, like on 
fixed hardware. Tablets could do that for their internal displays.

But I am afraid a desktop, which cribbles all wide gamut monitors by 
default to sRGB, is suboptimal marketing.

kind regards
Kai-Uwe Behrmann
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