PackPNM

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== Software ==
 
== Software ==
[[Konvertor]]
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* [http://packjpg.encode.ru/?page_id=73 packPNM]
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* [[Konvertor]]
  
 
== Links ==
 
== Links ==

Revision as of 15:46, 18 October 2017

File Format
Name packPNM
Ontology
Extension(s) .ppn
Released 2011
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.

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".

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