Date   : Fri, 06 Jul 2001 09:47:26 +0100
From   : Russell Marks <russell.marks@...>
Subject: Re: Magazine test scans - Update

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.