[Digikam-users] jpeg compression

[Bjørn Kvisli]

Torsdag 28 juni 2007 18:20, skrev Daniel Bauer:
> On Donnerstag, 28. Juni 2007, Bjørn 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.
>
Daniel,
The article linked below says the same as you. I have to be carefull when 
using jpegs, I guess.
http://graphicssoft.about.com/od/formatsjpeg/a/jpegmythsfacts.htm

> I found that a jpg value of 88 in digiKam gives approx. same results as 80
> in photoshop (in quality and size). That's the value I use for my web pics.
>
> However, as long as you work with the pictures better use a lossless file
> format and only save the final pictures to .jpg (if at all). And leave the
> originals untouched.
>
> kind regards
>
> Daniel