Aras Pranckevicius
4275d85158
Fix #133214 : image vectorscope has incorrect horizontal scale
...
Both Image and Sequencer vectorscopes used YUV U,V coordinates
as-is, but their possible ranges are different: +-0.436 and
+-0.615 respectively.
It looks like more other software (ffmpeg, shotcut, etc.)
re-scales the vectorscope UV to fill up a square, i.e. streches
out the horizontal values, so do the same.
This fixes the "skin tone indicator" line, which at 123 degrees
(90 + 33 degrees to match positive I axis of YIQ color space) was
placed assuming the UV values fill up a square. So it was at the
wrong angle before.
The vectorscope horizontal scaling and skin tone indicator line now
matches other open source (ffmpeg, shotcut) and commercial (davinci
resolve, final cut pro) software packages.
Images in the PR.
Pull Request: https://projects.blender.org/blender/blender/pulls/133316
2025-01-21 13:55:15 +01:00
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