[Digikam-devel] Re: PGF filesize

[Gilles Caulier]

2011/6/22 Sven Burmeister <sven.burmeister at gmx.net>

> Am Mittwoch, 22. Juni 2011, 12:36:41 schrieb Gilles Caulier:
> > Between 1.9.0 and 2.0.0, there is a few small size difference :
> >
> > http://www.flickr.com/photos/digikam/5859258197/sizes/o/in/photostream/
> >
> > http://www.flickr.com/photos/digikam/5859258245/sizes/o/in/photostream/
>
> I found the reason!
>
> If one saves a JPG to PGF, the size is small, i.e. ~100kb for a 10 MPx
> image.
>

JPG = > 8 bits / color /pixel image !


>
> However if one demosaics a RAW picture, crops it to only 2 MPx and saves it
> as
> lossy low quality PGF it still has 1,5 MB, i.e. 15 times as big as saving
> from
> JPG although it only has 1/5 of the size.
>
>
RAW = > 16 bits / color /pixel image !



> Is this a bug?
>

no. It's normal. Try this :

load JPEG in editor and save it as PGF. Look size.
reload JPEG in editor and switch color depth to 16 bits (Colors Menu). Now
save it as PGF. Lokk size...

Gilles Caulier


>
> Sven
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