https://www.temlib.org/AtariForumWiki/index.php?action=history&feed=atom&title=MacPaint_file_format 2026-07-27T07:31:53Z Revision history for this page on the wiki MediaWiki 1.39.2 https://www.temlib.org/AtariForumWiki/index.php?title=MacPaint_file_format&diff=14932&oldid=prev 2017-01-03T00:29:04Z

<p>New page</p> <p><b>New page</b></p><div>&lt;pre&gt;<br /> MacPaint *.MAC<br /> <br /> 1 long version number [0=ignore header, 2=header valid]<br /> 38 * 8 bytes 8x8 brush/fill patterns. Each byte is a pattern row,<br /> and the bytes map the pattern rows top to bottom. The<br /> patterns are stored in the order they appear at the bottom<br /> of the MacPaint screen top to bottom, left to right.<br /> 204 bytes unused<br /> -------------<br /> 512 bytes total for header<br /> <br /> &lt; 51200 bytes compressed bitmap data<br /> -------------<br /> &lt; 51712 bytes total<br /> <br /> NOTE: The version number is actually a flag to MacPaint to indicate if<br /> the brush/fill patterns are present in the file. If the version is 0,<br /> the default patterns are used. Therefore you can simply save a MacPaint<br /> file by writing a blank header (512 $00 bytes), followed by the packed<br /> image data.<br /> <br /> Bitmap compression:<br /> <br /> The bitmap data is for a 576 pixel by 720 pixel monochrome image.<br /> The packing method is PackBits (see below). There are 72 bytes per<br /> scan line. Each bit represents one pixel; 0 = white, 1 = black.<br /> &lt;/pre&gt;<br /> See also [[PackBits Compression Algorithm]]<br /> <br /> Back to [[ST Picture Formats]]</div>

>Lp