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How to create a matplotlib colormap that treats one value specially?
To create a matplotlib colormap that treats one value specially, we can take the following steps −
- Set the figure size and adjust the padding between and around the subplots.
- Get a colormap instance, name is "rainbow".
- Set the color for low out-of-range values, using set_under('red') method.
- Create random data and eps using numpy.
- Create a figure and a set of subplots.
- Display data as an image, i.e., on a 2D regular raster, using imshow() method.
- Create a colorbar for a ScalarMappable instance, im.
- To display the figure, use show() method.
Example
import matplotlib.pyplot as plt
import numpy as np
plt.rcParams["figure.figsize"] = [7.50, 3.50]
plt.rcParams["figure.autolayout"] = True
cmap = plt.get_cmap('rainbow')
cmap.set_under('red')
data = np.random.randn(5, 5)
eps = np.spacing(0.0)
fig, ax = plt.subplots()
im = ax.imshow(data, interpolation='nearest', vmin=eps, cmap=cmap)
fig.colorbar(im, extend='min')
plt.show()Output
Updated on: 03-Aug-2021
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