Pixelate, resize, change format, reduce number of colors
Mona Lisa
Mona Lisa reduced to 27 colors
Preparation
Have the image file available in .JPG or .PNG format. Reduce image size to less than 48 megapixels.
Determine the number of large pixels on the height or width of the image. The number of large pixels on the other side is calculated automatically to maintain the shape (or ratio) of the image. On the side for which the number of large pixels is specified, the maximum is 400.