A tool to keep local thumbnails in large trees of photos and other images up to date.
After years of digital photography a huge collection of pictures has grown. And, over the years I use different tools for browsing and sorting these photos. In addition the photos are shared via NFS and SAMBA over my private network.
In this case I thought of thumbnails which are part of my directories where the photos itself are placed. To manage these thumbnails, I wrote updateThumbnails.
updateThumbnails is running on Linux, and should also work on other UNIX platforms as long as the packages are available which updateThumbnails depends on.
- stores the thumbnails of photos in a dot directory
- stores thumbnails for different applications and sizes
- supports XV thumbnails
- supports generation of GNOME local thumbnails as used by GQview
- only generates thumbnails if the original image has changed
- removes thumbnails where the original file no longer exists
updateThumbnails depends on some other software packages:
Download the tar ball, extract it and start the installation as root:
tar xvzf updateThumbnails-1.1.tgz
Before the first use of updateThumbnails you have to create a dot file in your home directory named .updateThumbnails.rc which could look like this:
# updateThumbs rc file
THUMBNAILS="SCREEN THUMBS THUMBLOCAL XVPICS"
# screen resolution file dimensions
# thumbs resolution file dimensions
# thumblocal resolution file dimensions
# xvpics resolution file dimensions
# JPG quality for JPG files
# file extensions to scan
# directories to scan
But what does this all mean? So, let's have a look:
THUMBNAILS holds a list of names which updateThumbnails should process. For each of these names, a subdirectory will be created (where the directory name is this name in lower case, preceeded by a dot). In the example: the directories .screen, .thumbs, .thumblocal, and .xvpics will be generated in each directory updateThumbnail is going to process.
NOTE: the processing of THUMBLOCAL and XVPICS will trigger a special handling in updateThumbnails.
For each of the named thumbnails in THUMBNAILS, a definition of the with and height should be done, so that updateThumbnails will know the dimensions of the thumbnails.
NOTE: the thumbnails in THUMBNAILS should be arragned from largest to smallest thumbnail dimensions, because updateThumbnails will generate a thumbnail from the next larger thumbnail before the original image will be used. This gives a dramatic speed-up of the thumbnail processing.
The JPG_QUALITY can be used to fine tune the compression rate of JPEG images.
EXTENSIONS holds the extensions of images updateThumbnails will search.
DIRECTORIES is a list of directories updateThumbnails should process if no directory is given on the command line.