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Path: utzoo!linus!decvax!mcvax!uva!dolf
From: dolf@uva.UUCP (Dolf Starreveld)
Newsgroups: net.micro.apple
Subject: Format of MacPaint documents
Message-ID: <129@uva.UUCP>
Date: Mon, 9-Jul-84 07:21:37 EDT
Article-I.D.: uva.129
Posted: Mon Jul  9 07:21:37 1984
Date-Received: Tue, 10-Jul-84 07:46:28 EDT
Organization: Comp. Science Dept., University of Amsterdam
Lines: 25

This is what I now of the format of MacPaint:

MacPaint documents use only the data fork of a file, the resource
fork may be ignored. The data fork contains a 512 byte header and then
compressed data, representing a single bitmap of 576 pixels by 720 pixels.

HEADER:
4 bytes		Version number (default = 2)
38 * 8 bytes	304 bytes of patterns
204 bytes	reserved for future use

Version number 0 means that the complete header will be ignored and
standard patterns will be used.

BITMAP	(following the header):

720 scanlines of compressed data.
This is 720 times the output of the Packbits routine.

		
		Dolf Starreveld,
		University of Amsterdam

		{ ... mcvax!uva!dolf }