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[FEATURE]: Aliases for ffmpeg tone curves and primaries

See original GitHub issue

Issue Description

Ffmpeg provides a large set of primaries and transfer functions (OETFs) for use as metadata in video formats, with the -color_trc and -color_primaries parameters (or equivalent AVFrame members).

Allowed values for these options are stated to come out of ISO/IEC 23001-8:2013 in libavutil/pixfmt.h, and reference existing standards and recommendations that are for the most part already implemented in colour-science.

Is there any interest in adding aliases to let people reference these more easily?

Issue Analytics

State:
Created 9 months ago
Comments:10 (7 by maintainers)

Top GitHub Comments

1reaction

ValZapodcommented, Jun 10, 2022

And the luma vs luminance changes

Well, technically we do support linear transfer (so Y of YCbCr is indeed Y of XYZ) just not in ffplay directly (strange open bug), alas, but mpv that uses ffmpeg almost in full, does support it using ffmpeg primitives.

Check with mpv vs ffplay: https://forum.videohelp.com/attachments/43324-1507526652/dpx-sequence.zip

We do (at least with zscale) support constant luminance, where Y of YCbCr is indeed Y of XYZ since you first apply the matrix on to get linear Y of YCbCr and only then apply nonlinearity to get Y’.

1reaction

KelSolaarcommented, May 16, 2022

If they are all the same we could alias them as an option, we sometimes do that, e.g. https://github.com/colour-science/colour/blob/develop/colour/characterisation/datasets/colour_checkers/sds.py#L3188, then we would describe that they are all the same in the doctrings. colour.models.rgb.video works for me!

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