Random shuffle on image pixels (based on https://stackoverflow.com/a/52437794/9214270)

randimage.py

import scipy.ndimage
import scipy.misc
import numpy as np
import sys
import os.path

if len(sys.argv) < 2:
    exit(1)

numShuffles = 1 if len(sys.argv) < 3 else int(sys.argv[2])

#Loads an arbitrary RGB image from the misc library
rgbImg = scipy.ndimage.imread(sys.argv[1])

# doc on shuffle: multi-dimensional arrays are only shuffled along the first axis
# so let's make the image an array of (N,3) instead of (m,n,3)
rndImg2 = np.reshape(rgbImg, (-1, rgbImg.shape[2]))

for i in range(numShuffles):
    #now shuffle
    np.random.shuffle(rndImg2)

    #and reshape to original shape
    rdmImg = np.reshape(rndImg2, rgbImg.shape)

    path, filename = os.path.split(sys.argv[1])
    scipy.misc.imsave(os.path.join(path, 'shuffled' + str(i+1) + '_' + filename), rdmImg)
    rndImg2 = rdmImg