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

[Gilles Caulier]

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 <knizek.confy at volny.cz>:
> 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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