HyperCard image compression algorithm

[Info-Mac]

Path: utzoo!mnetor!uunet!husc6!mit-eddie!uw-beaver!ubc-vision!alberta!calgary!radford
From: [email protected] (Radford Neal)
Newsgroups: comp.sys.mac.hypercard
Subject: HyperCard image compression algorithm
Message-ID:
Date: 8 Dec 87 20:59:05 GMT
Organization: U. of Calgary, Calgary, Ab.
Lines: 20

Hypercard is said to use a very good method of compression
images. Does anyone know details on this?

- Does it work on bit-map images only? MacDraw-style pictures?
Mac II color images?

- How much does it compress the image? This may vary depending
on whether we're talking about a simple pie chart or a digitized
photograph.

- What exactly is the algorithm?

I'm interested in this from a general data compression viewpoint, not
so much the way it's used in HyperCard.

Thanks in advance. You should probably mail to me rather than post. I'll
post a summary (provided local news software is working that week...)

Radford Neal
The University of Calgry