https://temlib.org/AtariForumWiki2018/index.php?action=history&feed=atom&title=PackBits_Compression_Algorithm 2026-10-18T10:30:35Z Revision history for this page on the wiki MediaWiki 1.30.0 https://temlib.org/AtariForumWiki2018/index.php?title=PackBits_Compression_Algorithm&diff=6950&oldid=prev 2018-06-03T23:00:52Z

<p>1 revision imported</p> <table class="diff diff-contentalign-left" data-mw="interface"> <tr style="vertical-align: top;" lang="en"> <td colspan="1" style="background-color: white; color:black; text-align: center;">← Older revision</td> <td colspan="1" style="background-color: white; color:black; text-align: center;">Revision as of 23:00, 3 June 2018</td> </tr><tr><td colspan="2" style="text-align: center;" lang="en"><div class="mw-diff-empty">(No difference)</div> </td></tr></table>

AtariWikiSysop https://temlib.org/AtariForumWiki2018/index.php?title=PackBits_Compression_Algorithm&diff=6949&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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