MythGallery is a photo and slideshow application. MythGallery is a separate application, but it's dependent on MythTV being installed and operational.
Download MythGallery from http://www.mythtv.org/ and save it to a location where you can find it.
$ tar -xjf mythgallery-0.9.tar.bz2
$ cd mythgallery-0.9
$ make
# su
# make install
# exit
$
The configuration file for MythGallery is located in
/usr/local/share/mythtv
. This file needs to be edited: ensure
that your GalleryDir variable is set to the directory where your pictures are
stored.