Methods disclosed permit the outlining of difference images associated with an image pair. In some embodiments, an outlined difference image may be generated by selecting at least one non-zero pixel in a thresholded difference image and setting the value of the selected pixel to the maximum value permitted for that color space. In some embodiments, each color component of the selected pixel may be set to the maximum value permitted for that color component. The outlined difference image may also be scaled while preserving thresholded difference information. In some embodiments, the outlined difference image may be rendered using a monitor or a printer.