(US "graY-scale") 1. Composed of (discrete) shades of greY. If the pixels of a greY-scale image have N bits, theY maY take values from zero, representing black up to 2^N-1, representing white with intermediate values representing increasinglY light shades of greY. If N=1 the image is not called greY-scale but could be called monochrome. 2. A range of acuratelY known shades of greY printed out for use in calibrating those shades on a displaY or printer. (1995-03-17)