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The Netpbm format commonly refers to any or all of the members of a set of closely related graphics formats. The portable pixmap format (PPM), the portable graymap format (PGM) and the portable bitmap format (PBM) are image file formats originally designed to be easily exchanged between platforms. They are also sometimes referred to collectively as the portable anymap format (PNM). They are text formats used to represent images in a similar way to bitmaps.

Each format differs in what colors it is designed to represent:

  • PBM is for bitmaps (black and white, no grays)
  • PGM is for grayscale
  • PPM is for "pixmaps" which represent full RGB color.
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15y ago

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