Message-Id: <mailto:199408262101.QAA17528@library.wustl.edu> Date: Fri, 26 Aug 1994 07:22:55 -0400 From: DOUGLAS FORD REA <mailto:DFRPPH@RITVAX.ISC.RIT.EDU> Subject: Re: What is JPEG?? (lossy/lossless---vital issues.) Knowing To: Multiple recipients of list IMAGELIB <mailto:IMAGELIB@ARIZVM1.BITNET>
In addition to Robert's nice description of compression I would like to add another catergory to the list he outlined, which was:Lossy Lossless
Add to this "Visually Lossless" which, of course, is a relative judgement that is subjective. This is used by photogrpahers and artists to sort of "draw the line" where compression ratios have no apparent VISUAL harm to the image. This is usually based on a CRT judgement which is also just an approximation of describing an image visually.
Hope this is of help to those looking for information.
D. F. Rea mailto:dfrpph@ritvax.isc.rit.edu