bpo-45775: Implement rgb_to_yuv and yuv_to_rgb for colorsys #29512
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Misc/NEWS.d/next/Library/2021-11-10-00-22-14.bpo-45775.e5tVoB.rst
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| these color spaces are floating point values. In the YIQ and YUV space, the | ||
| Y coordinate is between 0 and 1, but the I, Q, U and V coordinates can be | ||
| positive or negative. In all other spaces, the coordinates are all between | ||
| 0 and 1. |
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Should we note what’s the range for I, Q, U, V too or is it obvious if you’re familiar with YIQ/YUV?
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From the BT.709 standard, U should be [-0.436...0.436], and V should be [-0.615...0.615], but since YIQ is using the FCC NTSC, its range in float terms (as opposed to wavelength terms) doesn't seem to be well documented (but it seems to be roughly [-0.5984...0.5984] for I, and [-0.5246..0.5246] for Q).
Since it's kind of varied I figure it's probably best to not bulk these in with this section, but maybe they belong somewhere else (e.g. with the methods?), or if there's a reliable document with these values it might be worth linking to that instead.
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The https://bugs.python.org/issue45775 has been rejected. You can write your own module on PyPI with more advanced features if you want to extend colorsys ;-) |
https://bugs.python.org/issue45775
https://bugs.python.org/issue45775