2012/3/23 Liam R E Quin <l...@w3.org>:
> On Fri, 2012-03-23 at 17:17 +0100, Olivier wrote:
>> The quality rate of JPEG is not a percentage, simply a rate between 0 and 
>> 100.
>
> A number in the range 0 to 100 is actually by definition a
> percentage ;-)

That's a weird definition of a percentage!

Considering the quality rating in JPEG as a percentage would mean that
a quality equal to 100 would be perfect, i.e. no loss at all.
Unfortunately, 100 means "very good", and 90 means "very good" too.
None of them is perfect, and the size of the file increases much
faster than the quality. This explains why many people recommend 85,
which is a good compromise.

Olivier Lecarme
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