Xref: utzoo comp.compression:740 alt.sex.pictures.d:4374 Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!think.com!snorkelwacker.mit.edu!bloom-beacon!eru!kth.se!cyklop.nada.kth.se!news From: d88-jwa@byse.nada.kth.se (Jon W{tte) Newsgroups: comp.compression,alt.sex.pictures.d Subject: Re: JPEG compression errors ?! Message-ID: Date: 12 Jun 91 11:00:35 GMT References: <1991Jun4.223719.2958@qualcomm.com> <1991Jun11.144958.4839@uicbert.eecs.uic.edu> <13405@pt.cs.cmu.edu> Sender: news@nada.kth.se (Mr News) Organization: Royal Institute of Technology, Stockholm, Sweden Lines: 23 In-reply-to: tgl@g.gp.cs.cmu.edu's message of 11 Jun 91 23:53:15 GMT tgl@g.gp.cs.cmu.edu (Tom Lane) writes: > eddins@uicbert.eecs.uic.edu (Steve Eddins) writes: > 2:1 compression with the lossless coder for "typical" scenes (whatever > that means). That means 2:1 compared to an uncompressed full-color image (24 bits/pixel). We knew that. I believe the question was whatever '"typical" scenes' means ? A picture of an empty sea ? A forest ? The mandelbrot set ? The November '92 playboy foldout :-) ? There's some doubt as to whether you can use the arithmetic coding method without paying royalties to IBM, however. You can, as long as you stay away from their specific implementation (called the Q-coder) -- Jon W{tte h+@nada.kth.se - Speed !