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
This plug-in changes colors in an image based on the HSV difference between two colors. This is particularly useful for applying color themes to existing images.
It avoids burning out high saturation and value at the expense of compression them somewhat when the difference goes towards higher saturation and value.
Current bugs/missing features include:
Undo does not work.
It can't be used on indexed images, even though it would frequently have enough colors.