[Cin] HDR -> sdr tonemap on cpu only

[Andrew Randrianasulu]

вт, 22 апр. 2025 г., 11:28 Andrea paz <gamberucci.andrea at gmail.com>:

> As far as I know, it is not advisable to use LUTs for color space
> conversion. They are good for the “color look.” Better to do it by
> hand. To get an idea of the steps to be taken (even if they cover the
> opposite case, i.e. SDR --> HDR, they are still rich in information):
>

yeah, thanks. Point is, ffmpeg is more tightly integrates various stages so
for example codec's side data may contain max luminance. After you decode
that to generic rgbaf32 timeline you lose this info.

By look of it mpv (0.39) + shift-i hotkey show hdr10/hdr10+ info if
available



> https://sourceforge.net/projects/qtpfsgui/
> https://codecalamity.com/encoding-uhd-4k-hdr10-videos-with-ffmpeg/
> Also:
> https://www.youtube.com/watch?v=7nI6VPTfvok
>
> In CinGG you could use “3 Color Way,” but it has the limitation of the
> “Value” slider.
>

Can you try to explain what is missed? Not enough room?



>
> PS: I had recently made additions to the HDR manual; the last 2
> commits. Could you please check and correct/delete the wrong parts? I
> am delving into the subject, but still confused.
>
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