A monochromic[1] image is composed of one color (or values of one color).[2] The term monochrome comes from the Ancient Greek: μονόχρωμος, romanizedmonochromos, lit. 'having one color'.

A monochromatic object or image reflects colors in shades of limited colors or hues. Images using only shades of grey (with or without black or white) are called grayscale or black-and-white. However, scientifically speaking, monochromatic light refers to visible light of a narrow band of wavelengths (see spectral color).