[Digikam-devel] context script to align and enfuse

[Arnd Baecker]

Hi Gerhard,

On Mon, 4 Feb 2008, Gerhard Kulzer wrote:

> I just created a script that I wanted to do for a long time now. Here is how it works:
> a) A <you_name_it>.desktop file need to be put into ~/.kde/share/applnk/.hidden/
> b) A script file needs to be referenced. I used ~/Scripte/enfuse. You have to put in the path where you store the script
> c) the script must be executable for the user (chmod o+x or chmod 700)
> d) select at least 2 files for HDR, they should be almost identical in their framing, slight differences will be realigned with align_image_stack program.
> e) right-click on them (digiKam restart required after .desktopn file installation) and you'll find 'enfuse' in the 'Open with' context menu
> f) have fun, the enfused image will show up in the same folder with a _enfuse insetion into the file name
> exiftool is used to copy metadata to the newly created image
>
> Todo
> I didn't yet manage to change the 'create date' of the new file to the exif create date. Anybody out there who knows how to do that? (except by by hand with digiKam obviously!)

If you omit the -P, does that work?

Or do you mean that you want to change the mtime of the file on disk?
Maybe with jhead:
http://planet.gentoo.org/developers/agriffis/2005/11/25/adjusting_exif_date_time_with_jhead

> A version with exiv2 would be welcome too to limit dependencies.

Yes ... ;-) (see below)

This is nice (though I haven't tested it, because I have
my own enfuse script, which is very similar ;-).

Some comments:
a) I would not call the script enfuse because this could
   be confused with enfuse (which does the real job ;-)
b) all the temporary files from the alignment are
   created in the directory where the originals are, i.e.
   in a directory visible to digikam. So the temporary
   images get added and deleted from the database
   (and become visible inbetween).
   Using a temporary directory might be better.
c) I also use exiftool in my script, I did not find a
   simple equivalent to
    exiftool -TagsFromFile "%s" -all:all "%s"
d) At the end I use:
     exiv2 ad -a 00:00:01 "%s"
  so that in a time-ordered view the enfused image appears
  after the originals
  (just a matter of taste).

e) The whole procedure of adding such a simple script is
   too complicated. We need
   http://bugs.kde.org/show_bug.cgi?id=88932
   don't we ?

And - important when shooting the bracketed images:
As input to enfuse it is advisable to
use a fixed aperture value with varying shutter speed.
(Variable aperture leads to different depth of field
and I had cases where the alignment of images failed,
presumably just because of this).

Best, Arnd