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Monochrome comes from the two Greek words mono (meaning "one") and chroma (meaning "surface" or "the colour of the skin"). If something is monochromatic, it only has a single color.

In physics, the word is used when talking about electromagnetic radiation of a single wavelength.

For an image, the term monochrome usually means the same as black-and-white or grayscale. It may also be used when talking about other combinations that only have two colors, for example, green-and-white or green-and-black. In computing, monochrome has two meanings:

  • It may mean having only one color which is either on or off. If it also has shades of that color, then it is called grayscale.
  • A monochrome computer monitor can only show a single color, often green, amber, red or white. It can often also show shades of that color.

pt:Luz monocromática