uncleflo
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The PBM Format
Saved by uncleflo on March 11th, 2012.
The PBM format is a lowest common denominator monochrome file format. It serves as the common language of a large family of bitmap image conversion filters. Because the format pays no heed to efficiency, it is simple and general enough that one can easily develop programs to convert to and from just about any other graphics format, or to manipulate the image.
The name "PBM" is an acronym derived from "Portable Bit Map."
This is not a format that one would normally use to store a file or to transmit it to someone -- it's too expensive and not expressive enough for that. It's just an intermediary format. In it's purest use, it lives only in a pipe between two other programs.
The format definition is as follows.
A PBM file consists of a sequence of one or more PBM images. There are no data, delimiters, or padding before, after, or between images.
PBM, PGM, PNM, and PPM: Summary from the Encyclopedia of Graphics File Formats
Saved by uncleflo on March 11th, 2012.
The Portable Bitmap Utilities (PBM) is a collection of programs organized, maintained, and primarily written by Jef Poskanzer. Although owned and copyrighted by Mr. Poskanzer, they are freely available in both source and executable form on the Internet and on many BBS systems. The "bitmap" in PBM is used in the older sense to refer to monochrome images. There are actually three other sets of programs encompassed by the PBM utilities. These are the Portable Greymap Utilities (PGM), the Portable Pixmap Utilities (PPM), and the Portable Anymap Utilities (PNM). PBM programs manipulate monochrome bitmaps, and PGM and PPM programs manipulate gray-scale bitmaps and color bitmaps, respectively. PNM programs operate on all of the bitmaps produced by the other programs. There is no file format associated with PNM itself. Most people call the overall set of programs PBM and the newer version pbmplus, however, and we'll follow this convention.
pbm pgm pnm ppm file format pixel image graphic bitmap monochrome information bmp
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