Hello, Consider the following quote from this OpenGL ES for iOS Book: And this quote: My question is how does one determine how many texels are in an image and how large those texels are. If I'm not mistaken 1 texel != 1 pixel, so you can't determine the number of texels by counting pixels. For example, the second quote describes an image with alternation black and white texels. How would you know if your image is composed of black and white texels.... who defines the texel size??