Matplotlib rotate image file by X degrees

Question

How can I rotate an image file and plot it in matplotlib?

I know I can open it using PIL and rotate it, but this seems way too much for this simple function, that I\

Answer 1

It seems matplotlib has moved on since this question was asked, and it can now natively support affine transformations of images without the user needing to fall back to low-level image manipulation routines.

This is now documented in the form of an example in https://matplotlib.org/gallery/images_contours_and_fields/affine_image.html.

Essentially, this requires specifying the appropriate transform keyword argument. The code provided in the original question would be updated as follows:

import matplotlib.pyplot as plt
from matplotlib import transforms

img = plt.imread('filename.png')

fig = plt.figure()
ax = fig.add_subplot(111)

tr = transforms.Affine2D().rotate_deg(rotation_in_degrees)

ax.imshow(img, transform=tr + ax.transData)
plt.show()