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def npcr(im1, im2): im1 = np.asarray(im1) im2 = np.asarray(im2) values = [0,0,0] for i in range(len(im1)): for j in range(len(im1[i])): for k in range(len(im1[i][j])): if im1[i][j][k] != im2[i][j][k]: values[k]+=1 length = im1.size/3 values = [(x/length) * 100 for x in values] return values