I guess that you should agree on constants and then stick to them.
Otherwise, we might have to add a parameter later to chose the
conversion standard.
The PR uses "ATSC BT.709 standard constant".
Wikipedia says:
"When encoding Y’CBCR video, BT.709 creates gamma-encoded luma (Y’)
using matrix coefficients 0.2126, 0.7152, and 0.0722 (together they
add to 1). BT.709-1 used slightly different 0.2125, 0.7154, 0.0721
(changed to standard ones in BT.709-2)."
https://en.wikipedia.org/wiki/Rec._709#Luma_coefficients
Victor
On Fri, Nov 12, 2021 at 11:28 PM Terry Reedy
https://github.com/python/cpython/pull/29512 adds what appears to be well written conversions between RGB and YUV color systems, with tests. Are we allowing such improvements? If not, a module docstring note or comment should be added.
-- Terry Jan Reedy
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