https://www.temlib.org/AtariForumWiki/index.php?action=history&feed=atom&title=PackBits_Compression_Algorithm 2026-05-13T17:16:10Z Revision history for this page on the wiki MediaWiki 1.39.2 https://www.temlib.org/AtariForumWiki/index.php?title=PackBits_Compression_Algorithm&diff=15820&oldid=prev 2017-01-02T21:03:47Z

<p>New page</p> <p><b>New page</b></p><div>&lt;pre&gt;<br /> PackBits Compression Algorithm<br /> <br /> The following packing algorithm originated on the Mac, was adopted by<br /> Electronic Arts/Commodore for use in the IFF standard, and then by Tom<br /> Hudson for use in DEGAS Elite. The algorithm is currently used in<br /> MacPaint, IFF, and DEGAS Elite compressed file formats. Each scan line<br /> is packed separately, and packing never extends beyond a scan line.<br /> <br /> For a given control byte 'n':<br /> 0 &lt;= n &lt;= 127 : use the next n + 1 bytes literally (no repetition).<br /> -127 &lt;= n &lt;= -1 : use the next byte -n + 1 times.<br /> n = -128 : no operation, not used.<br /> &lt;/pre&gt;<br /> Back to [[ST Picture Formats]]</div>

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