423b5459__Students_at_College_of_DuPage__definition
[file extension] mac (pronounced mac) [acronym meaning] MAC paint graphic [definition] 
monochrome MacPaint graphic file format. In order to take a MAC file from a Macintosh to a PC, a "MacBinary" header has to be added to the file format. MAC images can be transferred "back" from a PC to a Macintosh. The MAC format always requires an image width of 576 pixels and a height of 720 lines. For that reason files converted to the MacPaint format from other formats will be cropped or padded out as necessary to fit in the 576X720 pixels size.
Graphic File Formats for Digital Imaging Students at College of DuPage
definition