Converts a set of `f64` red, green and blue values in the range `0 <= x <= 1` to a 3-tuple of `u8` suitable for use as an [RGBInteger] Returns an error String if any of the arguments are not in the range `0 <= x <= 1` Ses also [floats_to_argb] # Arguments r - red. 0: no red, 1: fully red g - green. 0: no green, 1: fully green b - blue. 0: no blue, 1: fully blue
(r: f64, g: f64, b: f64)
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