MacPaint

MacPaint is the native image format of the MacPaint paint program for Apple Macintosh.

Images are always bi-level, 576×720 pixels in size, and use PackBits compression.

Format details
Some MacPaint files begin with a 128-byte MacBinary header; others do not. The next 512 bytes have little or no significance to most applications (they contain a version number, and usually a set of brush patterns). The pixel data starts at offset 512, or 640 if there is a MacBinary header.

Specifications

 * Technical Note PT 24
 * Picture format docs (of a number of formats including MAC)

Software

 * Konvertor
 * Netpbm: macptopbm. Use the  option if the file has a MacBinary header.
 * XnView
 * Farbfeld Utilities
 * CloudPaint: online MacPaint simulator
 * MacPaint and QuickDraw Source Code, at the Computer History Museum
 * Image Magick
 * Tom's Editor (supports MacPaint files with 512 and 640 offset)
 * Tom's Editor (supports MacPaint files with 512 and 640 offset)

Sample files

 * http://www.fileformat.info/format/macpaint/sample/index.htm
 * http://cd.textfiles.com/vgaspectrum/mac/
 * http://cd.textfiles.com/carousel344/PIC/
 * http://cd.textfiles.com/clipart1996/GRAPHICS/OTHER/
 * CHRISTIE.MAC
 * http://whatis.rest7.com/how-to-open-mac-file
 * https://telparia.com/fileFormatSamples/image/macPaint/

Links

 * , from the Encyclopedia of Graphics File Formats
 * Wikipedia: MacPaint