Xref: utzoo comp.compression:739 alt.sex.pictures.d:4370
Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!mips!ptimtc!nntp-server.caltech.edu!madler
From: madler@nntp-server.caltech.edu (Mark Adler)
Newsgroups: comp.compression,alt.sex.pictures.d
Subject: Re: JPEG compression errors ?!
Message-ID: <1991Jun12.084749.329@nntp-server.caltech.edu>
Date: 12 Jun 91 08:47:49 GMT
References: <1991Jun4.223719.2958@qualcomm.com> <1991Jun11.144958.4839@uicbert.eecs.uic.edu> <13405@pt.cs.cmu.edu>
Organization: California Institute of Technology, Pasadena
Lines: 10


>> 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
yet to notice the effect of this simple compression on a natural
image at normal viewing distance (four to six screen heights).

Mark Adler
madler@tybalt.caltech.edu