Netpbm formats
From Just Solve the File Format Problem
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(Moved PAM to its own article) |
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|subcat=Graphics | |subcat=Graphics | ||
|extensions={{ext|pbm}}, {{ext|pgm}}, {{ext|ppm}}, {{ext|pnm}} | |extensions={{ext|pbm}}, {{ext|pgm}}, {{ext|ppm}}, {{ext|pnm}} | ||
| + | |mimetypes={{mimetype|image/x-portable-anymap}}, others | ||
|pronom={{PRONOM|fmt/408}}, others | |pronom={{PRONOM|fmt/408}}, others | ||
|released=1988 | |released=1988 | ||
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* '''PAM''': Refer to [[PAM (Portable Arbitrary Map)]]. Although PAM is one of the Netpbm formats, it's different enough that it's best documented in a separate article. | * '''PAM''': Refer to [[PAM (Portable Arbitrary Map)]]. Although PAM is one of the Netpbm formats, it's different enough that it's best documented in a separate article. | ||
| − | == Identification == | + | == Identifiers and Identification == |
Each file begins with two ASCII characters, which serve as a signature. | 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. | + | The PBM, PGM, and PPM formats come in two varieties: a text (or "plain" or "ASCII") format, and a binary (or "raw") format. |
{| class="wikitable" | {| class="wikitable" | ||
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! Signature | ! Signature | ||
! PRONOM | ! PRONOM | ||
| + | ! MIME type | ||
|- | |- | ||
| − | |PBM, text || <code>P1</code> || {{PRONOM|x-fmt/164}} | + | |PBM, text || <code>P1</code> || {{PRONOM|x-fmt/164}} ||rowspan="2"| {{mimetype|image/x-portable-bitmap}}, {{mimetype|image/x-portable-anymap}} |
| − | | | + | |
| − | + | ||
| − | + | ||
| − | + | ||
|- | |- | ||
|PBM, binary || <code>P4</code> || {{PRONOM|fmt/409}} | |PBM, binary || <code>P4</code> || {{PRONOM|fmt/409}} | ||
| + | |- | ||
| + | |PGM, text || <code>P2</code> || {{PRONOM|fmt/407}} ||rowspan="2"| {{mimetype|image/x-portable-graymap}}, {{mimetype|image/x-portable-anymap}} | ||
|- | |- | ||
|PGM, binary || <code>P5</code> || {{PRONOM|fmt/406}} | |PGM, binary || <code>P5</code> || {{PRONOM|fmt/406}} | ||
| + | |- | ||
| + | |PPM, text || <code>P3</code> || {{PRONOM|x-fmt/178}} ||rowspan="2"| {{mimetype|image/x-portable-pixmap}}, {{mimetype|image/x-portable-anymap}} | ||
|- | |- | ||
|PPM, binary || <code>P6</code> || {{PRONOM|fmt/408}} | |PPM, binary || <code>P6</code> || {{PRONOM|fmt/408}} | ||
| Line 48: | Line 50: | ||
== Software == | == Software == | ||
| + | The PBM/PGM/PPM/PNM formats are widely supported. Software listed here has been arbitrarily selected. | ||
* [[Netpbm]] | * [[Netpbm]] | ||
| + | * [[ImageMagick]] | ||
== External links == | == External links == | ||
* [[Wikipedia:Netpbm format|Wikipedia: Netpbm format]] | * [[Wikipedia:Netpbm format|Wikipedia: Netpbm format]] | ||
Revision as of 16:34, 7 December 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: Refer to PAM (Portable Arbitrary Map). Although PAM is one of the Netpbm formats, it's different enough that it's best documented in a separate article.
Identifiers and 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 (or "plain" or "ASCII") format, and a binary (or "raw") format.
| Format | Signature | PRONOM | MIME type |
|---|---|---|---|
| PBM, text | P1 |
x-fmt/164 | image/x-portable-bitmap, image/x-portable-anymap |
| PBM, binary | P4 |
fmt/409 | |
| PGM, text | P2 |
fmt/407 | image/x-portable-graymap, image/x-portable-anymap |
| PGM, binary | P5 |
fmt/406 | |
| PPM, text | P3 |
x-fmt/178 | image/x-portable-pixmap, image/x-portable-anymap |
| PPM, binary | P6 |
fmt/408 |
See also
Specifications
Software
The PBM/PGM/PPM/PNM formats are widely supported. Software listed here has been arbitrarily selected.
