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jgomezdans/random.py

Created May 15, 2010 23:24
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Random colormap for matplotli
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random.py
import matplotlib,numpy
import pylab
# A random colormap for matplotlib
cmap = matplotlib.colors.ListedColormap ( numpy.random.rand ( 256,3))
pylab.imshow ( Z, cmap = cmap)
pylab.show()
@jmetz
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jmetz commented Nov 21, 2017 •
edited
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Try the following if you want a randomly shuffled version of an existing colormap (might be useful to avoid potentially bad colors from using purely random RGB values):

import numpy as np
import matplotlib.pyplot as plt
vals = np.linspace(0,1,256)
np.random.shuffle(vals)
cmap = plt.cm.colors.ListedColormap(plt.cm.jet(vals))

replacing jet with the colormap of your choice.

@dmenig
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dmenig commented Feb 3, 2018

hello. If you have a way to perform the same operation in opencv, i'm really interested ! (cmap isn't a proper opencv colormap)

@edwardando
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edwardando commented Mar 29, 2018 •
edited
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Brilliant, even better than glasbey on ImageJ

@kheffah
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kheffah commented Jul 2, 2018

This is awesome, very helpful. Thank you!

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