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matplotlib.colors rgb2hex is not the right inverse of hex2color #18574

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@SebastianoF

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@SebastianoF
>>> matplotlib.__version__
'3.3.2'
>>> from matplotlib.colors import rgb2hex, hex2color
>>> rgb_color = (0.5, 0.5, 0.9)
>>> hex2color(rgb2hex(rgb_color))
(0.5019607843137255, 0.5019607843137255, 0.9019607843137255)

It should return (0.5, 0.5, 0.9).
As it seems the additive factor it is always the same, it should be a matter of subtracting 0.0019607843137255 from the three channels.

Thanks!


P.S. the inverse composition works as expected:

>>> rgb2hex(hex2color( '#808080'))
'#808080'

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