to_rgba(c, alpha=None)
If alpha is given, force the alpha value of the returned RGBA tuple to alpha.
If None, the alpha value from c is used. If c does not have an alpha channel, then alpha defaults to 1.
alpha is ignored for the color value "none"
(case-insensitive), which always maps to (0, 0, 0, 0)
.
Tuple of floats (r, g, b, a)
, where each channel (red, green, blue, alpha) can assume values between 0 and 1.
Convert c to an RGBA color.
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