[issue14323] Normalize math precision in RGB/YIQ conversion
Mark Dickinson
report at bugs.python.org
Fri Apr 20 23:24:47 CEST 2012
Mark Dickinson <dickinsm at gmail.com> added the comment:
Terry: sorry, I missed this before.
Re 1. Sure, this seems reasonable, if there's a real sense in which the new numbers are better than the old. Besides MATLAB, there's also a set of numbers given on Wikipedia that might be considered. I don't have the domain knowledge to know what's sensible here.
I *would* rather see the inverse transformation keep the full 6 digits of precision, though. Or perhaps even give the inverse to full float precision. Without that, the result of roundtripping RGB -> YIQ -> RGB could be significantly (perhaps even visibly) different from the original. I don't think it's acceptable for the roundtrip error to increase significantly w.r.t. Python 3.2.
Re 2. For this issue, I don't see a real benefit to adding the tests to the maintenance releases. No strong opinions, though.
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<http://bugs.python.org/issue14323>
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