Netpbm formats
From Just Solve the File Format Problem
(Difference between revisions)
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|formattype=electronic | |formattype=electronic | ||
|subcat=Graphics | |subcat=Graphics | ||
| − | |extensions={{ext|pbm}} | + | |extensions={{ext|pbm}} {{ext|pgm}}<br>{{ext|ppm}} {{ext|pnm}}<br>{{ext|pam}} |
}} | }} | ||
== Overview == | == Overview == | ||
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'''PAM''' (portable arbitrary map) is a more sophisticated format which supports everything the PBM, PGM, and PPM formats do, and then some. | '''PAM''' (portable arbitrary map) is a more sophisticated format which supports everything the PBM, PGM, and PPM formats do, and then some. | ||
| − | The PBM, PGM, and PPM formats come in two varieties: a text format, and a binary format. PAM is binary-only. | + | The PBM, PGM, and PPM formats come in two varieties: a text ("plain") format, and a binary ("raw") format. PAM is binary-only. |
| + | |||
| + | == Identification == | ||
| + | Each file begins with two ASCII characters, which serve as a signature. | ||
| + | |||
| + | * PBM, text: <code>P1</code> | ||
| + | * PGM, text: <code>P2</code> | ||
| + | * PPM, text: <code>P3</code> | ||
| + | * PGM, binary: <code>P4</code> | ||
| + | * PPM, binary: <code>P5</code> | ||
| + | * PPM, binary: <code>P6</code> | ||
| + | * PAM: <code>P7</code> | ||
| + | |||
| + | == See also == | ||
| + | * [[PFM]] | ||
== Specifications == | == Specifications == | ||
Revision as of 06:18, 13 March 2013
Contents |
Overview
The Netpbm formats are a set of uncompressed raster image file formats, associated with the Netpbm library and suite of image processing utilities.
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 not really a format, but is a collective name for PBM, PGM, and PPM.
PAM (portable arbitrary map) is a more sophisticated format which supports everything the PBM, PGM, and PPM formats do, and then some.
The PBM, PGM, and PPM formats come in two varieties: a text ("plain") format, and a binary ("raw") format. PAM is binary-only.
Identification
Each file begins with two ASCII characters, which serve as a signature.
- PBM, text:
P1 - PGM, text:
P2 - PPM, text:
P3 - PGM, binary:
P4 - PPM, binary:
P5 - PPM, binary:
P6 - PAM:
P7
