Re: Why does saves as JPG default to quality 85?

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On Fri, 2012-03-23 at 21:52 +0100, Olivier wrote:

> 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.
Nonsense. A "quality" of 100% means you have chosen 100 out of a
possible 100. "per cent" means "out of 100" in Latin. It says nothing
about secondary values. A value of 75% means 75% of the way from 0 to
the maximum allowed value of 100. I agree that popular usage is to infer
more than is stated from such an assertion. Note that in general (but
not in this case) percentages can be greater than 100.

Yes, many people recommend 85% but 85% in gimp (or 85, if you prefer) is
not at all the same as 85% in PhotoShop.

Maybe it would be less confusing to make the numbers go from 0 to 255 or
something. Then 255 would be 100% of the allowed value.

Best,

Liam

-- 
Liam Quin - XML Activity Lead, W3C, http://www.w3.org/People/Quin/
Pictures from old books: http://fromoldbooks.org/
Ankh: irc.sorcery.net irc.gnome.org www.advogato.org

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