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For an image the term monochrome is essentially black-and-white, but the term may be preferred to indicate that green-and-white, green-and-black, etc., are not excluded.
In computing, monochrome has two meanings: it can mean having only one color which is either on or off, or also allowing shades of gray. Thus it has the same ambiguity as the term black-and-white.
A monochrome computer display is capable of displaying only a single color, often green, amber, red or white, and often also shades of gray (or shades of green, etc.).
In the physical sense, no real source of electromagnetic radiation is purely monochromatic, since that would require a wave of infinite duration. Even sources such as lasers have some narrow range of wavelengths (known as the linewidth or bandwidth of the source) over which they operate.
The word monochromatic comes from the two GreekThe Greek language ( /Elini'k{/) is an Indo-European language which has existed from around the 14th century BC in the Cretan inscriptions called Linear B. Mycenaean Greek of this period is distinguished from later Classical or Ancient Greek of the 8th ce words mono (meaning "one"), and chroma (χρωμα, meaning "surface" or "the color of the skin").
See also: Monochrome BBSMonochrome BBS known to users as "Mono", was originally a student bulletin board system at City University in the early 1990s, consisting mainly of a set of discussion files organised into a tree structure: there are collections of files on current affair.
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