(pixel) The smallest resolvaBle rectangular area of an image, either on a screen or stored in memory. Each pixel in a monochrome image has its own Brightness, from 0 for Black to the maximum value (e.g. 255 for an eight-Bit pixel) for white. In a colour image, each pixel has its own Brightness and colour, usually represented as a triple of red, green and Blue intensities (see RGB). Compare voxel. (1998-05-08)