The spectrum of gray from absolute black to absolute white. Typically, non-color televisions are referred to as "black and white", but actually (especially to geeks) they are grayscale, since the pixels can be an analog value of brightness somewhere on the range from black to white.

Grayscale is more often used as a term to refer to computer imagery containing no color, but containing at least some levels of gray. However, a strictly two-color-only black and white image is not considered grayscale.

Approximately 30% of the time, this term is (acceptably) spelled as 'greyscale'.