Date   : Fri, 06 Jul 2001 12:52:52 +0100
From   : Tim Fardell <tim.fardell@...>
Subject: Re: Magazine test scans - Update

PNG supports lossless compression, and is becoming more and more
widespread. I don't know of any Web browsers that don't support them. I
have no personal experience with them so I'm not sure what the
compression ratios are like, but by all accounts it compresses very
well. Might be worth investigating? 

Russell Marks wrote:
> 
> Paul Wheatley <p.r.wheatley@...> wrote:
> 
> > This is only an issue if you don't set the quality of compression high
> > enough. If you want to use JPEG as a handy, widely used, open format then
> > simply compress all images on 100 which makes them lossless. They will still
> 
> Not true. From the JPEG FAQ:
> 
> > Except for experimental purposes, never go above about Q 95; using Q 100
> > will produce a file two or three times as large as Q 95, but of hardly any
> > better quality.  Q 100 is a mathematical limit rather than a useful setting.
> > If you see a file made with Q 100, it's a pretty sure sign that the maker
> > didn't know what he/she was doing.
> 
> Conventional JPEG is never lossless. While a lossless variant of JPEG
> *does* exist, it's not very good and probably isn't what you meant.
> 
> -Rus.

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