HELP! * GREY=local LOCAL HTML version of Foils prepared Sept 1996

Foil 15 Graphics File Formats: PBM, PGM, PNM, PPM and the pbmplus programs

From Image Format Basics CPS606fall96 -- Fall Semester 96. by Nancy J. McCracken * Critical Information in IMAGE
This is a collection of simple formats and utilities written and maintained by Jef Poskanzer, and available on most Unix systems.
  • PBM (Portable BitMap) - monochrome
  • PGM (Portable GreyMap) - gray-scale
  • PPM (Portable PixMap) - color
  • PNM (Portable aNything) - for programs which operate on any format
The headers have fields: MagicValue, ImageWidth, ImageHeight, MaxValue (not on PBM)
The MagicValues are PBM - P1(ascii) and P4 (raw), PGM - P2 and P5, PPM - P3 and P6
Example of a PPM file - each pixel has 3 (RGB) values:

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Page produced by wwwfoil on Wed Feb 19 1997