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Fix clipping of rgb_from_vector()

Dieter Weber requested to merge colorclipping into master
  • Clip saturation and luminance separately to make sure the result is clipped at the maximum possible saturation or luminance
  • Ensure that the argument of np.arccos(...) is within the allowed range to avoid NaN

Previously, clipping by specifying vmax resulted in strange colors, likely from NaN and/or improper clipping.

TODO make sure the change doesn't affect the result if vmax is not set.

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