1. A method for detecting anti-aliasing images comprising: determining two extremal colors present in a two-color image in a color space; determining a line in said color space connecting the two extremal colors present in said image; testing each pixel in said image to determine if each pixel lies on, or within an error margin, of said line in said color space; if any pixel lies outside said error margin, determining that said image is not a two-color anti-aliased image; compressing data representing said image as data representing a non-two-color anti-aliased image; transmitting said data representing said image; de-compressing said data representing said image; and displaying said image on a display screen of a display device.