[Digikam-users] jpeg compression

[Bjørn Kvisli]

Torsdag 28 juni 2007 19:01, skrev Mikolaj Machowski:
> Dnia czwartek 28 czerwiec 2007, Daniel Bauer napisał:
> > On Donnerstag, 28. Juni 2007, Bj?rn Kvisli wrote:
> > > If I understand this right, assuming that the Kodac C340 uses jpeg
> > > quality of 70 internally, it makes no sense to set a higher value in
> > > Digikam?
> >
> > it still makes sense, because every new save looses some more
> > information. Although its not that dramatic in reality, you could think
> > of percents just to better understand: then if you save the 70% with
> > 100% you get 70% again, if you save it with 70% you get only 49% (70% of
> > 70%) and so on.
>
> AFAIU JPEG this is not exactly true. Quality is level of losing
> information. After saving to 70 you lost all information above that and
> next savings to 70 shouldn't cause losing of more detail.

Well, I really hope this is the case. Loosing detail with each save would 
really be bad.
-Bjørn
>
> Note however that different implementations may differ and 70 level in
> one program isn't exactly the same 70 in another.
>
> m.
>
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