Summary: by a tuple of three numbers for RGB images (the red, green, and blue), 4 numbers for colour images with an alpha channel, and just single numbers for greyscale or one-bit images: Example2b.py shows one way of working with pixels like this. In the drawFrame function it extracts the list of pixels and then reads through them, checking the levels of red and green in
Image Dimensions: 470 x 57
Image originally found here.