mono - For an image, the term monochrome is usually taken to mean the same as black-and-white or, more likely, grayscale, but may also be used to refer to other combinations containing only two colors, such as green-and-white or green-and-black. It may also refer to sepia or cyanotype images. In computing, monochrome has two meanings: it may mean having only one color which is either on or off, or allowing shades of that color, although the latter is more correctly known as grayscale: from Wikipedia - the free encyclopedia