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BUG: Convert qualitative colormaps to ListedColormap #3973

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Merged
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Feb 18, 2016
Merged

BUG: Convert qualitative colormaps to ListedColormap #3973

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df3b769
ENH: Qualitative colormaps as ListedColormap
endolith Jul 19, 2015
80fa23e
DOC: Update docs about qualitative colormaps
endolith Jul 19, 2015
411d0b3
MAINT: Simplify ColorBrewer maps to match Excel
endolith Dec 4, 2015
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11 changes: 11 additions & 0 deletions doc/api/api_changes/qualitative colormaps.rst
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Qualitative colormaps
---------------------

Colorbrewer's qualitative/discrete colormaps ("Accent", "Dark2", "Paired",
"Pastel1", "Pastel2", "Set1", "Set2", "Set3") are now implemented as
``ListedColormap`` instead of ``LinearSegmentedColormap``.

To use these for images where categories are specified as integers, for
instance, use::

plt.imshow(x, cmap='Dark2', norm=colors.NoNorm())
9 changes: 9 additions & 0 deletions doc/users/whats_new/qualitative colormaps.rst
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Qualitative colormaps
---------------------

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