Example: In case of 8x8 matrix
8, 8,
128, 128, 128, 128, 128, 128, 128, 128, 255, 128, 128, 128, 128, 128, 128, 128, 255, 255, 128, 128, 128, 128, 128, 128,
255, 255, 255, 128, 128, 128, 128, 128,
8 elements
255, 255, 255, 255, 128, 128, 128, 128, 255, 255, 255, 255, 255, 128, 128, 128, 255, 255, 255, 255, 255, 255, 128, 128, 255, 255, 255, 255, 255, 255, 255, 128,
8 elements
80