MacPaint

File Format
Name	MacPaint
Ontology	Electronic File Formats Graphics MacPaint
Extension(s)	.mac, .pntg
PRONOM	x-fmt/161

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

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. The pixel data starts at offset 512, or 640 if there is a MacBinary header.

Identifiers

• MacBinary type: PNTG

Sample files

• http://www.fileformat.info/format/macpaint/sample/index.htm

Specifications

• Technical Note PT 24

Software

• Netpbm: macptopbm. Use the -extraskip 128 option if the file has a MacBinary header.
• CloudPaint: online MacPaint simulator

Resources

• Macintosh Paint, from the Encyclopedia of Graphics File Formats
• Picture format docs (of a number of formats including MAC)