[Digikam-users] How does digiKam do raw conversions for the slide shows ?

[Adam Petty]

I think canon stores 3 or 4 of them. The TIFF is actually a lossless compressed jpg. 



----- Original Message ----
> From: Gilles Caulier <caulier.gilles at gmail.com>
> To: digiKam - Home Manage your photographs as a professional with the power of open source <digikam-users at kde.org>
> Sent: Wed, December 23, 2009 1:11:29 PM
> Subject: Re: [Digikam-users] How does digiKam do raw conversions for the slide shows ?
> 
> As Milan said, RAW are containers, and can include more than one
> preview JPEG, dedicated for different use...
> 
> Gilles Caulier
> 
> 
> 2009/12/23 Milan Knížek :
> > Linuxguy123 píše v St 23. 12. 2009 v 10:25 -0700:
> >> > Yes, it use JPEG preview. Fast and usefull...
> >>
> >> Are you serious/ sure this is the case ?  I always thought the preview
> >> jpegs were thumbnails.  I displayed the slideshow images on a 52" LCD TV
> >> at 1920x1080.  There was no way they were thumbnails.
> >
> > JPEG preview may not be the same as JPEG thumbnail in general meaning.
> >
> > E.g. Canon EOS 5D MII stores a small resolution JPEG, full resolution
> > JPEG and raw data in the CR2 files. The full resolution JPEG is kind of
> > equal to the JPEG that camera produces (if raw is not used), but
> > possibly with lower JPEG quality settings.
> >
> > Use
> >
> > $ exiv2 -pp image.cr2
> > Preview 1: image/jpeg, 160x120 pixels, 11197 bytes
> > Preview 2: image/jpeg, 5616x3744 pixels, 1127852 bytes
> >
> > to find out and
> >
> > $ exiv2 -ep1,2 image.cr2
> >
> > to actually extract the first and the second preview JPEG at the same
> > time. (This is not conversion from RAW!)
> >
> > Exiftool may do the same job, read the man page...
> >
> > Regards,
> >
> > Milan Knizek
> > knizek (dot) confy (at) volny (dot) cz
> > http://www.milan-knizek.net - About linux and photography (Czech
> > language only)
> >
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