8000 Backport PR #21727 on branch v3.5.0-doc (Doc fix colormap inaccuracy) by meeseeksmachine · Pull Request #21731 · matplotlib/matplotlib · GitHub
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Backport PR #21727 on branch v3.5.0-doc (Doc fix colormap inaccuracy) #21731

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Merged
timhoffm merged 1 commit into from
Nov 24, 2021
Merged

Backport PR #21727 on branch v3.5.0-doc (Doc fix colormap inaccuracy) #21731

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14 changes: 8 additions & 6 deletions tutorials/colors/colormap-manipulation.py
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Original file line number Diff line number Diff line change
Expand Up @@ -132,12 +132,14 @@ def plot_examples(colormaps):
plot_examples([viridis, newcmp])

##############################################################################
# We can easily reduce the dynamic range of a colormap; here we choose the
# middle 0.5 of the colormap. However, we need to interpolate from a larger
# colormap, otherwise the new colormap will have repeated values.

viridis_big = cm.get_cmap('viridis', 512)
newcmp = ListedColormap(viridis_big(np.linspace(0.25, 0.75, 256)))
# We can reduce the dynamic range of a colormap; here we choose the
# middle half of the colormap. Note, however, that because viridis is a
# listed colormap, we will end up with 128 discrete values instead of the 256
# values that were in the original colormap. This method does not interpolate
# in color-space to add new colors.

viridis_big = cm.get_cmap('viridis')
newcmp = ListedColormap(viridis_big(np.linspace(0.25, 0.75, 128)))
plot_examples([viridis, newcmp])

##############################################################################
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