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Colour mode

The colour mode is a setting that determines the depth to which colours can be displayed in an image file. This also affects the size of the file.

The most common colour modes are:

  • RGB mode (millions of colours)
  • CMYK mode (colours for four-colour printing)
  • Lab/CIELab
  • Index mode (256 colours)
  • Grayscale (256 shades)
  • Bitmap (2 colours: Black or white)

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