PackPNM
From Just Solve the File Format Problem
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[[packPNM]] is a utility and format for losslessly compressing many [[Netpbm formats|PNM]], [[BMP]], and [[Radiance HDR]] image files. Like its counterpart [[packJPG]], it can be thought of as a graphics format, or as a special-purpose compression format. | [[packPNM]] is a utility and format for losslessly compressing many [[Netpbm formats|PNM]], [[BMP]], and [[Radiance HDR]] image files. Like its counterpart [[packJPG]], it can be thought of as a graphics format, or as a special-purpose compression format. | ||
| + | |||
| + | See also [[packARC]]. | ||
== Identification == | == Identification == | ||
Apparently, the header of the file is left unchanged, except that the first byte is changed to 0x53 (ASCII "S"). So, a packPNM-compressed binary PPM file begins with "S6" instead of "P6". A compressed BMP file begins with "SM" instead of "BM". | Apparently, the header of the file is left unchanged, except that the first byte is changed to 0x53 (ASCII "S"). So, a packPNM-compressed binary PPM file begins with "S6" instead of "P6". A compressed BMP file begins with "SM" instead of "BM". | ||
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| + | == Software == | ||
| + | * [http://packjpg.encode.ru/?page_id=73 packPNM] | ||
| + | ** [https://github.com/packjpg/packPNM GitHub repository] | ||
| + | * [[Konvertor]] | ||
== Links == | == Links == | ||
* [http://packjpg.encode.ru/?page_id=73 packPNM website] | * [http://packjpg.encode.ru/?page_id=73 packPNM website] | ||
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{{DISPLAYTITLE:packPNM}} | {{DISPLAYTITLE:packPNM}} | ||
[[Category:Compression]] | [[Category:Compression]] | ||
| + | [[Category:Recompression]] | ||
[[Category:Compression research]] | [[Category:Compression research]] | ||
Latest revision as of 17:13, 9 October 2020
packPNM is a utility and format for losslessly compressing many PNM, BMP, and Radiance HDR image files. Like its counterpart packJPG, it can be thought of as a graphics format, or as a special-purpose compression format.See also packARC.
[edit] Identification
Apparently, the header of the file is left unchanged, except that the first byte is changed to 0x53 (ASCII "S"). So, a packPNM-compressed binary PPM file begins with "S6" instead of "P6". A compressed BMP file begins with "SM" instead of "BM".
