[argyllcms] Re: Scaled Rec709 TRC question
- From: Alexander <adfirestone@xxxxxxxxx>
- To: argyllcms <argyllcms@xxxxxxxxxxxxx>
- Date: Mon, 14 Feb 2011 00:45:25 -0800
Graeme Gill wrote:
> Since you haven't explained exactly what you want to match, it difficult
> to say. dispcal has a range of ways of dealing with the non perfect black
> of the device, and this can have a noticeable subjective effect.
>
> Graeme Gill.
>
>
>
It sounds like he wants to create some generic presets for different ambient
light conditions for use with lcms2.
For example, 0 lux Ambient Light, 32 lux Ambient Light, 64 lux Ambient
Light.
Using lcms2 and an ICC profile, he wants to be able match the video lut
curves dispcal produces when calibrating using the -a parameter on a
particular display. I assume?
An example use case would be:
1) Calibrate your display with dispcal -g709 -a32.
2) Create an ICC profile with colprof.
3) In MPC-HC media player, enable lcms2 color management.
4) Choose the REC.709 32 lux ambient light preset.
5) Play a REC.709 video
6) lcms2 loads the system ICC profile, applies color correction, gamut
correction, and gamma correction.
7) The video is output with the same perceived REC.709 curve (scaled to 32
lux ambient light) that dispcal produces.
János, seems to want to know how to go about implementing steps 4, 6, and 7.
Currently MPC-HC with lcms2 can only do the following:
1) In MPC-HC media player, enable lcms2 color management.
2) Choose a preset 2.2 Gamma (Bright), 2.35 Gamma (Dim), 2.4 Gamma (Dark)
5) Play a REC.709 video
6) lcms2 loads the system ICC profile, applies color correction, gamut
correction, and gamma correction.
7) The video is output with whichever gamma preset is chosen. This results
in a perceived 2.2, 2.35, or 2.4 gamma power-curve on your display.
He wants the option of outputting an ambient light scaled REC.709 curve
instead of the limited current behavior of outputting a generic power-curve
for everything.
Is this correct János, or did I misunderstand you?
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