Change Scale of imshow in Matplotlib Without Stretching Image

To change the scale of imshow in matplotlib without stretching the image, we can take the following steps.

Steps

• Set the figure size and adjust the padding between and around the subplots.

• Create random data points with 4×4 dimension.

• Display the data as an image, i.e., on a 2D regular raster.

• Use the extent parameter of imshow to map the image buffer pixel coordinates to a data space coordinate system.

• Next, set the aspect ratio of the image manually by supplying a value such as "aspect=4" or let it auto-scale by using aspect='auto'. This will prevent stretching of the image. By default, imshow sets the aspect of the plot to 1.

• To display the figure, use Show() method.

Example

import numpy as np
from matplotlib import pyplot as plt

plt.rcParams["figure.figsize"] = [7.00, 3.50]
plt.rcParams["figure.autolayout"] = True

data = np.random.rand(4, 4)

plt.imshow(data, origin='lower', extent=[-4, 4, -1, 1], aspect=4)

plt.show()

Output

It will produce the following output −