Path: utzoo!mnetor!uunet!husc6!bloom-beacon!gatech!bbn!rochester!ken
From: ken@cs.rochester.edu (Ken Yap)
Newsgroups: comp.lang.postscript
Subject: Re: Run-length encoding for image data?
Message-ID: <9440@sol.ARPA>
Date: 6 May 88 17:43:53 GMT
References: <2387@uvacs.CS.VIRGINIA.EDU>
Reply-To: ken@cs.rochester.edu (Ken Yap)
Organization: U of Rochester, CS Dept, Rochester, NY
Lines: 21

|Has anyone successfully implemented a run-length-encoding scheme for
|compressing pixel information sent to the image operator?  Several attempts

Ray,

Have you tried byte level run-length encoding, i.e.

	00 00 00 00 00 13 13 13 13 24

is encoded as

	5 * 00, 4 * 13, 24

in some scheme. I know of some screen dump programs that do this.  I
don't know exactly how much this wins. Obviously downloading is faster
but processing is slower.

The other thing I know is that rotating an image 90 degress in
PostScript is slow. Best to do it in your dump program if you can.

	Ken