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Merge pull request matplotlib#3973 from endolith/Qualitative_ListedColormap
API: Convert qualitative colormaps to ListedColormap
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‎doc/api/api_changes/qualitative colormaps.rst‎

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Qualitative colormaps
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---------------------
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Colorbrewer's qualitative/discrete colormaps ("Accent", "Dark2", "Paired",
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"Pastel1", "Pastel2", "Set1", "Set2", "Set3") are now implemented as
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``ListedColormap`` instead of ``LinearSegmentedColormap``.
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To use these for images where categories are specified as integers, for
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instance, use::
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plt.imshow(x, cmap='Dark2', norm=colors.NoNorm())

‎doc/users/whats_new/qualitative colormaps.rst‎

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Qualitative colormaps
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---------------------
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ColorBrewer's "qualitative" colormaps ("Accent", "Dark2", "Paired",
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"Pastel1", "Pastel2", "Set1", "Set2", "Set3") were intended for discrete
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categorical data, with no implication of value, and therefore have been
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converted to ``ListedColormap`` instead of ``LinearSegmentedColormap``, so
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the colors will no longer be interpolated and they can be used for
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choropleths, labeled image features, etc.

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