[issue14323] Normalize math precision in RGB/YIQ conversion

[Roundup Robot]

Roundup Robot added the comment:

New changeset 80e9cb6163b4 by Serhiy Storchaka in branch 'default':
Issue #14323: Expanded the number of digits in the coefficients for the
http://hg.python.org/cpython/rev/80e9cb6163b4

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nosy: +python-dev

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<http://bugs.python.org/issue14323>
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