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. | ||
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| + | See also [[packARC]]. | ||
== Identification == | == Identification == | ||
Revision as of 16:42, 4 January 2018
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.
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".
