[Digikam-users] jpeg compression

[Gilles Caulier]

2007/6/28, Bjørn Kvisli <bjorn.kvisli at tele2.no>:
>
> Torsdag 28 juni 2007 20:24, skrev Arnd Baecker:
> > On Thu, 28 Jun 2007, [utf-8] Bjørn Kvisli wrote:
> >
> > [...]
> >
> > > Well, I really hope this is the case. Loosing detail with each save
> would
> > > really be bad.
> >
> > Have a look at
> > http://www.cywarp.com/faq_jpg_degradation.htm
> > (Of course best is to try it out ... ;-)
> >
> I tried to save a picture quite a few times, but could not see the effect
> of
> degradation as descibed in the linked article. I guess I have to find out
> more about this.
> Digikam also has a setting for png compression. Mine is set to 9
> (maximum). Is
> png still lossless?
>

yes, PNG is always lossless (zip like), as TIFF compression do (deflate) :

http://en.wikipedia.org/wiki/Png

Note : unlike wikipedia said, PNG support Exif, IPTC, and XMP as well.
Digikam full support Exif/Iptc with PNG, as ImageMagick or Exiftool can do.

Gilles
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