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From: McFarland.henr@Xerox.COM
Newsgroups: net.micro.amiga
Subject: IFF Dpaint format
Message-ID: <1508@caip.RUTGERS.EDU>
Date: Wed, 12-Mar-86 03:45:58 EST
Article-I.D.: caip.1508
Posted: Wed Mar 12 03:45:58 1986
Date-Received: Fri, 14-Mar-86 05:34:11 EST
Sender: daemon@caip.RUTGERS.EDU
Organization: Rutgers Univ., New Brunswick, N.J.
Lines: 27

From: McFarland.henr@Xerox.COM




I'm working on a project that requires some pretty pictures, so we've
decided to use DPaint as a graphics tool. So far, I've spent the last
couple of evenings investigating the structure of DPaint IFF files,
locating the CMAP, GRAB, CRNG etc. structures, as well as what I suspect
is the designator for graphics files called ILBMBMHD, and the bitmap
data in the BODY subrecord.

In the ILBMBMHD subrecord, in addition to the bitmap width and height,
and what appears to be fixed data, I've noticed a compression flag and a
few other bytes of formatting information. Further investigation shows
that scan line planes are run length encoded, and proceed until a run
length of zero is reached. At this point, the compression algorithm
seems to change, and I've not been able to decode it yet. 

Does anyone know what the compression flags are, and what the algorithm
is ?

	Thanks in advance

		Doug McFarland