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fix: map zero magnitude to black in max_chroma_colormap #23

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fix: map zero magnitude to black in max_chroma_colormap #23

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5 changes: 4 additions & 1 deletion complex_colormap/cplot.py
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Original file line number Diff line number Diff line change
Expand Up @@ -141,7 +141,7 @@ def max_chroma_colormap(z, nancolor='gray'):

>>> max_chroma_colormap([[np.inf, 0, 10j, np.nan]])
array([[[ 1. , 1. , 1. ],
[ 0.051, 0. , 0.001],
[ 0. , 0. , 0. ],
[ 0.863, 0.694, 0. ],
[ 0.502, 0.502, 0.502]]])
"""
Expand All @@ -166,6 +166,9 @@ def max_chroma_colormap(z, nancolor='gray'):
# White for infinity (colorspacious doesn't quite reach it for J = 100)
rgb[np.isinf(z)] = (1.0, 1.0, 1.0)

# Black for zero magnitude (interpolation leaves a tiny residual chroma)
rgb[np.equal(z, 0)] = (0.0, 0.0, 0.0)

# Color NaNs
rgb[np.isnan(z)] = to_rgb(nancolor)

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