Message-Id: <mailto:199507101458.JAA01834@library.wustl.edu> Date: Mon, 10 Jul 1995 10:02:10 -0600 From: Kurt Foss <mailto:kfoss@MURROW.JOURNALISM.WISC.EDU> Subject: Re: Archiving images and documents painlessly To: Multiple recipients of list IMAGELIB
At 8:28 AM 7/10/95, Lynn Lickteig wrote:>Since even though you can obtain
>substantial drive space savings using JPEG, the amount save is inversely
>proportional to the amount of retained image quality.
Another factor is image content -- an image w/o lots of subtle details -- ie. vast expanses of sky, snow, etc -- can be compressed to a much greater degree than one with considerably more fine detail and gradations. So degree of compression is not necessarily directly related to the image quality after compression. And the resolution/size of the original file also has a bearing in how much JPG compression one will find acceptable -- a higher-res file compressed at 20:1 could actually have better quality than a low-res file compressed at 8:1, for example. JPG compression of screen-res files is often not a pretty sight -- experimentation is in order.
Rgds ~ Kurt
~~~~~~~~~~~~~~~~~~~~~~~~~~~~my vitals~~~~~~~~> KURT FOSS * U_of Wisconsin-Madison * School of Journalism and Mass Comm. 5020 Vilas, Communication Hall * 821 University Avenue * Madison, WI 53706 Email: mailto:kfoss@murrow.journalism.wisc.edu * kfoss@itis.com * CIS: 70541,1040 Phone: Voice 608-263-3391 * FAX 608-262-1361 * Home 608-271-1210 Technology Editor, NPPA Electronic Photojournalism Workshop EPW7 Sept. 8-16 WWW1: ONline WISCONSIN> http://www.journalism.wisc.edu/olw-home WWW2: NPPA> http://sunsite.unc.edu/nppa ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~-30-~~~~~~~~~~~~