If you ever wanted an easy way to merge three photos with different exposure settings taken from the same scene together to one image with a well balanced dynamic range - well here is the solution.
Shoot three images of one scene (with a tripod) with an exposure difference of 2-3 between two pictures. The middle one should be taken at the [P] (automatic) setting of your camera, then an over- and an underexposed one.
And be sure not to alter the aperture setting! Solely adjust the shutter speed because otherwise you would get different depth of field values.
Just getting this up, so the description will be short for now. Double HSV Film Grain was originally a work-around that simulates Photoshop's film grain filter. It has become more than that, though. Simple to use, it has a few features that go beyond simple noise filters. There is the option to either compress the layers down to the original, or keep the three separate working layers to be manipulated individually. There is also an option to limit the working layers to just two noise layers.
Still testing it for bugs, so any input would be appreciated.
A Windows binary of this plugin by Claes G Lindblad (http://www.algonet.se/~claesg/shapeit.html), ported to 2.x by Victor Ramirez. Almost a "lost and found" plugin?
It bends a text or an image according to a shape.
Create the map on a new layer. Should be black and white for best results. Add an alpha channel to both layers.
PDF version of the tutorial by Claes included.
A simple plug-in to do fourier transform on you image. The major advantage of this plugin is to be able to work with the transformed image inside GIMP. You can so draw or apply filters in fourier space, and get the modified image with an inverse FFT.