Path: utzoo!attcan!uunet!portal!cup.portal.com!Lou From: Lou@cup.portal.com (William Joseph Marriott) Newsgroups: comp.sys.mac Subject: PackBits Message-ID: <21167@cup.portal.com> Date: 10 Aug 89 07:19:56 GMT Organization: The Portal System (TM) Lines: 13 Before a MacPaint file is saved, a call is made to the Mac ROM call PackBits(). The only thing I've found describing this call is that it is a very simple data compression technique; this was from the relevant section in Inside Macintosh. Does anyone know precisely how the bitmapped image is packed? The data is needed so that a "MacPaint" file can be created on a PC-compatible and transmitted to the Mac. APDA lacks the formats and information required, apparently. Any other obvious resources I'm overlooking?