[Digikam-devel] Image Metadata extraction : implementation progress...

[F.J.Cruz]

El Martes, 28 de Febrero de 2006 11:09, Gilles Caulier escribió:
> Hi all digiKam users/team,
>
> Like you have seen last week, I have started a new implementation of
> metadata viewer using libExiv2 instead the current Exif viewer using
> libkexif.
>
> A fresh screenshot can be seen here :
>
> http://digikam3rdparty.free.fr/Screenshots/digikam0.9.0-alpha6.png
>
> After any days of indeep testing, the implementation is more mature. Like
> you can see in this screenshot, we have :
>
> - A standard Exif metatada viewer.
> - An Exif  Maker Notes viewer
> - An IPTC metadata viewer.
> - Support of CRW metadata (thanks exiv2)
> - Support of Raw profiles embedded (Exif/IPTC) in PNG files built by
> ImageMagick during JPEG -> PNG conversion.
> - Each sidebar tab can be filtered to "Simple" (user friendly: the more
> important for photograph) and to "Full" (all metadata).
> - All metadata groups are more visible than old Exif viewer.
>
> The implementation is based on 2 parts :
>
> -> One metadata extractor witch detect the file type and use a dedicaced
> loader to construct Exiv2 metadata container. Actually JPEG, PNG and CRW
> files are supported. I have planed to do TIFF/DNG files and any others RAW
> files like NEF (Paco if you is interresed (:=)))) and MRW. The
> implementation is similar to Digikam::DImg container (about loader)...
>

Of course,I'm very interested on metadata support in digiKam, especially NEF 
files since I'm owner of a D50.In fact, along this last week I've been having 
a look to exiv2 code and I want to make you some questions:

- How are you going to implement metadata infor for files that are not 
implemented in exiv2 yet? Actually exiv2 has support only for CRW files (one 
of the two Canon RAW formats, the other one is CR2), altough there are files 
with makernotes specifications for a lot of manufacturers, so if I want to 
implement metadata extraction for NEF files, have I to implement the 
equivalent to crwimage in Exiv2? this can be a hard work if we have to do 
this for all the manufacturers who provide RAW format.

- What's about "write-access" on iptc data?

- Which of all  these changes are for 0.9.0?

- Where do we came from, who are we, where do we go to?.....do we live in an 
infinite universe?

Paco