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Show a grayscale Open CV image with Matplotlib

To show a grayscale OpenCV image with matplotlib, we can take the following steps

  • Set the figure size and adjust the padding between and around the subplots.
  • The function imread loads an image from the specified file and returns it.
  • The function converts an input image from one color space to another.
  • Display the data as an image, i.e., on a 2D regular raster.
  • To display the figure, use show() method.

Example

import cv2
from matplotlib import pyplot as plt
plt.rcParams["figure.figsize"] = [7.50, 3.50]
plt.rcParams["figure.autolayout"] = True
img = cv2.imread("baseball.png")
image = cv2.cvtColor(img, cv2.COLOR_RGB2GRAY)
plt.imshow(image, cmap="gray")
plt.show()

Output

Show a grayscale Open CV image with Matplotlib