Netpbm formats
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== See also == | == See also == | ||
| − | * [[PFM]] | + | * [[PFM (Portable Float Map)]] |
== Specifications == | == Specifications == | ||
Revision as of 16:34, 29 November 2013
The Netpbm formats are a family of simple raster image file formats, associated with the Netpbm library and suite of image processing utilities.
Contents |
Formats
PBM (portable bitmap) is a bi-level image format.
PGM (portable graymap) is a grayscale image format.
PPM (portable pixmap) is a color image format.
PNM (portable anymap) is a collective name for PBM, PGM, and PPM. A .pnm file may use any of those formats.
PAM (portable arbitrary map) is a more sophisticated format which supports everything the PBM, PGM, and PPM formats do, and then some. Some resources incorrectly name this format "Portable Any Map".
Identification
Each file begins with two ASCII characters, which serve as a signature.
The PBM, PGM, and PPM formats come in two varieties: a text ("plain") format, and a binary ("raw") format. PAM is binary-only.
| Format | Signature | PRONOM |
|---|---|---|
| PBM, text | P1 |
x-fmt/164 |
| PGM, text | P2 |
fmt/407 |
| PPM, text | P3 |
x-fmt/178 |
| PBM, binary | P4 |
fmt/409 |
| PGM, binary | P5 |
fmt/406 |
| PPM, binary | P6 |
fmt/408 |
| PAM | P7 |
fmt/405 |
