Answers for "how does matplotlib display gray images colores"

3

plt.imshow grayscale

plt.imshow(arr, cmap='gray', vmin=0, vmax=255)
Posted by: Guest on May-17-2020
2

Image to grayscale using python

import numpy as np
import matplotlib.pyplot as plt
import matplotlib.image as mpimg

def rgb2gray(rgb):
    return np.dot(rgb[...,:3], [0.299, 0.587, 0.144])

img = mpimg.imread('img.png')

gray = rgb2gray(img)

plt.imshow(gray, cmap='gray')

plt.savefig('greyscale.png')
plt.show()
Posted by: Guest on July-22-2021

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