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ENH: add modified CMRmap colormap with improved linearity #5172

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ENH: add modified CMRmap colormap with improved linearity #5172

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b38c82c
add CMRmap2 cmap
zblz Oct 3, 2015
f63c7e5
add CMRmap2 to colormaps docstring
zblz Oct 3, 2015
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13 changes: 13 additions & 0 deletions lib/matplotlib/_cm.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1889,6 +1889,18 @@ def gfunc32(x):
(0.875, 0.50, 0.50),
(1.000, 1.00, 1.00))}

# Modification of CMRmap to improve linearity of luminance
# by Christopher Hummersone, BSD Licensed
# http://www.mathworks.com/matlabcentral/fileexchange/39552-modified-cmrmap
_CMRmap2_data = ((0.0, 0.0, 0.0),
(0.1, 0.1, 0.35),
(0.3, 0.15, 0.65),
(0.6, 0.2, 0.50),
(1.0, 0.25, 0.15),
(0.9, 0.55, 0.0),
(0.9, 0.75, 0.1),
(0.9, 0.9, 0.5),
(1.0, 1.0, 1.0))

# An MIT licensed, colorblind-friendly heatmap from Wistia:
# https://github.com/wistia/heatmap-palette
Expand Down Expand Up @@ -1927,6 +1939,7 @@ def gfunc32(x):
'bwr': _bwr_data,
'brg': _brg_data,
'CMRmap': _CMRmap_data,
'CMRmap2': _CMRmap2_data,
'cool': _cool_data,
'copper': _copper_data,
'cubehelix': _cubehelix_data,
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6 changes: 6 additions & 0 deletions lib/matplotlib/pyplot.py
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Expand Up @@ -2106,6 +2106,8 @@ def colormaps():
maintains an aesthetically pleasing color image that
automatically reproduces to a monotonic grayscale with
discrete, quantifiable saturation levels." [#]_
CMRmap2 Modified version of CMRmap that improves its luminosity
linearity for low values. [#]_
cubehelix Unlike most other color schemes cubehelix was designed
by D.A. Green to be monotonically increasing in terms
of perceived brightness. Also, when printed on a black
Expand Down Expand Up @@ -2161,6 +2163,10 @@ def colormaps():
<http://www.mathworks.com/matlabcentral/fileexchange/2662-cmrmap-m>`_
by Carey Rappaport

.. [#] See `Modified CMRmap
<http://www.mathworks.com/matlabcentral/fileexchange/39552-modified-cmrmap>`_
by Christopher Hummersone

.. [#] Changed to distinguish from ColorBrewer's *Spectral* map.
:func:`spectral` still works, but
``set_cmap('nipy_spectral')`` is recommended for clarity.
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