GIMP Plugin Registry

What is Color Spotter? Basically, it's contrast, but "centered" around a color. Another way to see it is as another "Color selection" tool: you specify an image, a kind of threshold, and it selects color that are close to the one you specified; only, Color Spotter keeps every pixel from the image, darkening the wanted colors, brightening the others.  read more »

This script sharpens an image using some simpel layer manipulations. It offers a Radius and a strength operator to increase strength vs quality. I also added a simpel brightness correction in order to remove highlights created by a too high sharpening value. IT's therefore recommended to increase the correction value when increasing the strength value a lot.

I have created a wrapper script to allow a number of existing filters to have tileable results (assuming the input layer is tilable).
This script creates the following new menu entries (modeled after the Tileable Blur provided in Gimp already):
Filters >Distorts >Tileable Emboss
Filters >Blur >Tileable Motion Blur
Filters >Distorts >Tileable Wind
Filters >Light and Shadow >Tileable Sparkle
Filters >Noise >Tileable Slur
Filters >Noise >Tileable Spread
Filters >Artistic >Tileable Cubism
Filters >Artistic >Tileable Oilify
Filters >Artistic >Tileable Photocopy
Filters >Artistic >Tileabl  read more »

The G'MIC plug-in for GIMP defines a set of various filters, including artistic filters, image denoising and enhancement, 3D renderers, etc..  read more »

The code still have some accuracy bugs when compaired with its sdlBasic version, since i were getting some problems when recoding it to Python-Gimp.
The script converts a rgb picture into msx1 (also colecovision and sega sg1000) display limitations, which have a predefined palette, and a maximum of 2 colours in each 8x1 pixels cell, trying to provide this cell as the most close as possible from their rgb original.
As well, the code is a bit slow (a 320x240 picture can take around 1 minute on a 2ghz dualcore computer) since it processes pixel by pixel.  read more »

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, a contrast adjustment, as well as an option to keep the source layer or replace it.  read more »

This script simulates the colour effect you get when you cross process a film.

Before:

After:

This script simulates the effect of a soft focus.

Before:

After:

A tutorial on how to use this is coming soon.

This Shadow&Highlight script does a decent job of lightening shadows and/or darken highlights in photographs. The UI gives you five control sliders. Two for control of the Shadow and Highlight amount (opacity), two for the tonal width of each contrast mask layer (using gamma), and one for the blur radius of the masks. Plus the option to flatten visible layers when done.  read more »

Deskew, also called auto straighten, is the automatic rotation of an image such that the text is vertically aligned. This is great for cleaning up scanned documents.

http://www.cubewano.org/gimp-deskew-plugin/