Change pos of square img in original img: Pixel

min 2 pixels min 4 pixels min 8 pixels

max 256 pixels max 128 pixels max 64 pixels

Visualize box size of iteration:

none -1 iteration 0 iteration 1 iteration 2

Grayscale conversion:

0.299 * R + 0.587 * G + 0.114 * B 0.334 * R + 0.334 * G + 0.334 * B