On Tue, 14 Jun 2005, Doug Franklin wrote:

On Tue, 14 Jun 2005 11:07:38 -0400 (EDT), Kenneth Waller wrote:

Mike, jpeg, by definition is a compression program. No matter
what the setting, when utilized, it will by definition toss out
some info.

That's because JPEG is JPEG, not because it's a compression program.
Many compression algorithms exist that do not lose any data.

Foe example <drumroll> lossless jpeg!

http://www.faqs.org/faqs/jpeg-faq/part1/section-13.html

Kostas

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