A grey scale image contains information about levels of darkness, but no colour. Usually grey scale images use 256 levels coded as a asingle byte per pixel, but sometimes 2 or 4 bits are used reuslting in 4 or 16
levels of grey.
Used in Chap. 12: pages 162, 163, 165, 179, 185
Also known as grey scale, grey scales, grey-scale