Re: Possible bug in display profiles auto-generated from EDID: 'chad' tag converts from PCS to device

[Florian Höch <lists+gnome-color-manager hoech org>]

Am 07.08.2011 09:55, schrieb Richard Hughes:
> Well, when creating the profile, GCM doesn't actually create the
> chromatic adaption state itself, it relies on the cmsCreateRGBProfile
> and the magic of lcms2. It's entirely possible that I'm doing
> something wrong here, and an expert eye on the code would be a very
> great thing (hint, hint) :-)
>
> The latest code for 3.2 is here:
> http://git.gnome.org/browse/gnome-settings-daemon/tree/plugins/color/gsd-color-manager.c#n539

Ok, I'm now pretty sure the problem is in LCMS in this case. It seems 
the arguments to the _cmsAdaptationMatrix function that creates the 
'chad' matrix are simply reversed, but there's nothing you can do about 
it in GCM because it's called in LCMS' cmsvirt.c/cmsCreateRGBProfileTHR. 
I'll report to the LCMS list.

Regards
--
Florian Höch