Re: What is JPEG?? (lossy/lossless---vital issues.) Knowing

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Message-Id: <mailto:199408270344.WAA12510@library.wustl.edu>
Date:         Fri, 26 Aug 1994 16:19:55 -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>

Compressing/Recompressing is (or can be) risky business.  Try to compress only
once if possible as a typical 8x8 kernal may not withstand recompression
without harmful side effects.

If possible try to save your data to inexpensive tape drives.  Only use
compression when absolutely required.  If you intend to do any reproduction of
images always avoid compression - especially those with low frequency areas
that show very slight brightness changes.  Such (images) are at risk of showing
banding, blocking, etc. after color seps are made.

D. F. Rea
RIT

• Next message: Bruce K Lane: "Re: Image access, large images, and the HP transparency adapter"
• Previous message: Vinod Chachra: "Re: What is JPEG?? (lossy/lossless---vital issues.) Knowing"
• Maybe in reply to: Robert MacKimmie: "What is JPEG?? (lossy/lossless---vital issues.) Knowing"
• Next in thread: Cynthia Frazier: "Re: What is JPEG?? (lossy/lossless---vital issues.) Knowing"