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Save all layers as TGA files, discarding alpha channels and applying layer masks as alpha if they exist. Name becomes imagename-layername.tga
This script is created by Joao S. O. Bueno at my request and I take no credit for it's development.
Appears in /Layer/Transparency/Copy Mask to Other layers of the Image window.
A simple plugin (my first) to run the cartoon effect on multiple images. It took me a while to write whilst trying to edit a lot of photos (for a short film about geography)
it is available from /Xtns/Misc/Batch cartoon effect

Converts every jpg-, png- and tif-Image into grayscale-Tif's, uses unsharp-mask and adjusts levels for offset-printing; works also in Subdirectories.
http://gimpfr.org/contrib_photolabo.php
http://gimpfr.org/contrib_photolabo_exiftools.php
Last update februar 23 2009, added ExifTools subset of 5 scripts
PhotoLab is a set of tools for digital pictures. All scripts are in Python, tested with Gimp-2.6.4 under Linux and Gimp-2.4 under Windows XP. Supported language: en,fr. read more »
A python script that generates a contact sheet or index print containing a configurable number of images. Multiple sheets are generated, the filename can also be included.

To install copy to ~/.gimp?-?/plug-ins/ directory or /usr/lib/gimp2-0/plug-ins/ and make executable with chmod +x contactsheet.py
This updated version works with version 2.4 of The Gimp, tiff support is included.
Thanks to Elmar at http://www.sullockenzlin.demon.nl/Gimp.html for the version update and language translations. read more »