Lomo-Gimp tries to give your digital pictures the warmth of those taken by an old rangefinder analog camera. Think of it as a Kodak Instamatic or a Lomo Holga faking effect. It enhances contrast and saturation, and applies a light and a dark overlay, trying to emulate incorrectness in exposition. Please note this does nothing to emulate the chromatic aberration peculiar in pictures taken using a real Lomo.
This script converts color images to B&W using channel mixer settings,
which simulate the use of color filters in B&W photography. It allows to choose many predefined filters and set their intensity. Previously posted to old registry in July 2006, now updated to work with GIMP 2.4. Avoid setting intensity to 1, besause it totally filters one of RGB channels and increases noise.
Makes landscapes around these lines, no color tho, that has to be done manually with overlay and multiply layers
Use Thumbnail sizes (400 x 300, good for a quick preview until you get something amazing)
Balance (affects the contrast/brightness balance in one of the mid steps, can give a little more "crisp" to final product) Detail (detail values in the difference clouds)
Depth (gives the mountains some more rugidness)
A general purpose high-pass filter plugin. It shows up as Filters->Generic->High Pass Filter. You can select a blur radius that sets the size of detail to be passed by the filter, as well as an option to keep the source layer or replace it.
EDIT: Updated to use grain extract rather than the previous method, This looses less histogram data and is closer to the Photoshop version...
It actually implements 5 different high pass modes: