[argyllcms] Re: Understanding display profiles
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Sun, 20 Jul 2008 13:42:41 +1000
Volker Sauer wrote:
To achieve an accurate output, do I always have to load the profile in
the software (in my case GIMP) *and* the LUT? Or do I have to load the
profile in the software *or* the LUT?
You need to distinguish between the calibration and the profile.
The calibration is optional, but if it is uses, it must always
be used for the profile to remain valid, since they are in series,
so the profile represents the calibrated state of the device.
Typically the calibration is also stored in the profile in the vcgt tag.
Assuming that GIMP just uses the profile information and doesn't
load the calibration (vcgt) into the video hardware, then if you
created a calibration and used that calibration during profiling,
then you need to make sure that both the calibration is loaded
and the application (GIMP) uses the profile.
If you did not create and use a calibration during profiling,
then (of course) there is nothing to load into the VideoLUT
(or rather, they should be set to linear, just like they
were during profiling), and just the profile can should be used
with the application.
Graeme Gill.
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