Powers of two. If an image needs to be scaled down in hardware it will be successively split in half, so 256 becomes 128 becomes 64, etc. The machine can hand

Powers of two. If an image needs to be scaled down in hardware it will be successively split in half, so 256 becomes 128 becomes 64, etc. The machine can handle any image size, but doing so requires it to simulate divided pixels with new colors and this "error" becomes more noticeable as the image is scaled repeatedly. Powers of two divide cleanly.