Note
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Selecting individual colors from a colormap#
Sometimes we want to use more colors or a different set of colors than the default color cycle provides. Selecting individual colors from one of the provided colormaps can be a convenient way to do this.
We can retrieve colors from any Colormap
by calling it with a float or a list of
floats in the range [0, 1]; e.g. cmap(0.5)
will give the middle color. See also
Colormap.__call__
.
Extracting colors from a continuous colormap#
import matplotlib.pyplot as plt
import numpy as np
import matplotlib as mpl
n_lines = 21
cmap = mpl.colormaps['plasma']
# Take colors at regular intervals spanning the colormap.
colors = cmap(np.linspace(0, 1, n_lines))
fig, ax = plt.subplots(layout='constrained')
for i, color in enumerate(colors):
ax.plot([0, i], color=color)
plt.show()
Extracting colors from a discrete colormap#
The list of all colors in a ListedColormap
is available as the colors
attribute.
See Also#
For more details about manipulating colormaps, see Creating Colormaps in Matplotlib. To change the default color cycle, see Styling with cycler.
References
The use of the following functions, methods, classes and modules is shown in this example:
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