Definition: (1) Image defined by values given to individual picture elements of an array whose extent is equal to that of the image; the image is the map of the bit-values of the individual elements. * All popular image formats such as TIFF, BMP, JPEG, PNG, GIF etc. are bit-mapped file formats. * Compare with PostScript or page description formats such as HPGL or Acrobat (PDF) which are outline formats. (2) An image comprising picture elements whose values are only either one or zero i.e. black or white: the corresponding bit-depth of the image is 1.

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