[Openicc] [ANNOUNCE] Compicc 0.8.3

Kai-Uwe Behrmann ku.b at gmx.de
Mon Nov 29 08:26:25 PST 2010

Am 29.11.10, 13:20 -0000 schrieb Richard Hughes:
> On 25 November 2010 15:12, Kai-Uwe Behrmann <ku.b at gmx.de> wrote:
>> The project brings you instant desktop colour correction on GPU through the
>> compiz window manager. It supports multi monitors and live connecting. The
>> implicite colour conversion appears on the fly.
> One thing that confuses me is how you should be dealing with VCGT
> data. For profiles that have VCGT data, do you create a tonecurve for
> each channel to remove the VCGT effect before you apply the GPU
> transform or just push the VCGT data to the video card like normal?

Merging of VCGT with the transform was thought of a feature. But I changed 
my mind about that regarding the colour server.
Its better to teach users not to omit VCGT in monitor device profiles 
for colour servers. On the other side, people who really want a 
calibration, for whatever reason, have still the possibility to 
use VCGT.

> I must admit, I'm not completely sure of the role of VCGT in a
> late-bound color workflow.

In my personal view they are rather obsolete. Lookup tables are precise 
enough in CompICC. Running a cheap Apple laptop monitor with osX with 
VCGT and Linux without, I never missed VCGT. On better hardware its even 
lesser needed.

> Richard.

kind regards
Kai-Uwe Behrmann
developing for colour management 
www.behrmann.name + www.oyranos.org

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