dechroma is a simple but effective chroma noise reduction tool. Chroma noise appears usually in high ISO photographs. The method used in this script allows to reduce noise but does not affect details. It decomposes the picture in the LAB channels, blurs the chroma noise on the red and blue channels, and recomposes the picture. The default settings of the blur radius should be appropriate for general uses, but can be change. It's probably safer to apply primarily dechroma on selections to avoid some red or blue smears on transitions.
This is rather old stuff, I was looking for an easy way to create html templates in an easy but open source kind of way. It is a perl-fu plugin for Gimp which allows you to draw your template as a multi-layered image, then automatically export it to html + individual png files. It was originally written for Gimp v.1, but it seems to work fine with Gimp v.2
# AUTHOR: Michael K. Nacos
# LICENSE: GPL (http://www.gnu.org/licenses/gpl.html)
# DESCRIPTION: perl-fu plugin for gimp which converts a multi-layered
# image to an html template + corresponding png images