Xref: utzoo comp.compression:743 alt.sex.pictures.d:4382 Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!mips!spool.mu.edu!olivea!mintaka!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 17:23:02 GMT References: <1991Jun4.223719.2958@qualcomm.com> <1991Jun11.144958.4839@uicbert.eecs.uic.edu> <13405@pt.cs.cmu.edu> <1991Jun12.084749.329@nntp-server.caltech.edu> Sender: news@nada.kth.se (Mr News) Organization: Royal Institute of Technology, Stockholm, Sweden Lines: 16 In-reply-to: madler@nntp-server.caltech.edu's message of 12 Jun 91 08:47:49 GMT > madler@nntp-server.caltech.edu (Mark Adler) writes: >> That means 2:1 compared to an uncompressed full-color image >> (24 bits/pixel). If true, that's rather unimpressive, since I can get 2:1 just by converting from RGB to YUV and averaging the UV pixels 4:1. I've Yes, but that's lossy. JPEG performs somewhat better when you allow it to be lossy... The 2:1 was for NOT lossy compression. You could still do better than that, methinks. -- Jon W{tte h+@nada.kth.se - Speed !