GIMP Plugin Registry

Draws one of five types of predefined spirals, or lets the user modify the power parameter. The formula is:

r = a + b * theta ^ n

r - radius
a - growth factor
b - multiplication factor
theta - angle
n - power factor

The predefined types are: Archimedean (n = 1), Fermat (n = 1/2), Circle (n = 0), Lituus (n = -1/2), Hyperbolic (n = -1). If you choose a predefined type, the power factor you input on the form will be disregarded.

A simple detail enhancing/sharpening filter based on my simple bilateral code. It is essentialy a low precision version of the detail enhancement stage of some local tone mapping algorithms.

In non technical terms this is basically the anti surface blur. It takes a surface blur as a base layer, compares it with the original image and magnifies the differences. It brings out textures and makes skin look pretty horrible.

It will appear under:

Filters->Enhance->Enhance Details...

A surface blur filter based on a simplified version Porikli's O(1) bilateral filter.

Unfortunately due to the nature of the algorithm memory overheads can be severe. This filter uses a tile based implementation, which limits overheads to about 64mb.

On the plus side it is reasonably fast and scales well with filter radius.

When installed it should appear under filters->blur->simple bilateral

There is a mercurial repository which will be kept up to date with the latest code on my web site. This can be accessed with:

hg clone http://www.spectral3d.co.uk/repo/gimp_plugins  read more »

This script simulates the color style of the movie "300":
http://en.wikipedia.org/wiki/300_%28film%29  read more »

Alters image to have gradually fading overlapped borders when tiled. Like The GIMP's filter Make Seamless, only not as strong an overlap. To achieve this, the image size is reduced. The overlap amount can be chosen by the user. The script can be accessed through /Filters/Map/Make Weakly Seamless...

This script simulates a photochrom image, a lithographic printing process from the 1890's:
http://en.wikipedia.org/wiki/Photochrom  read more »

Offsets all layers by half. Image/Half_Tile_Offset Useful when creating a tilable texture. Just press Alt+I,O and you can start editing the image-edge seams.

A workflow-friendly fast alternative to going around every layer and selecting Layer/Transform/Offset... / Offset by x2,y2 / OK

Usage:

Let's say we have this 256x256 crop:

   read more »

A new major version of the content-management-system of this site has been installed (Drupal 6.15, to be exact). This should result in a smoother, more performant site and also fix a few (rare) bugs.

While I have tried to test everything, if you notice anything has changed for the worse or does not work anymore, please let me know in the comments!

Also, some defaults may have changed. If you do not like this, let me know, too.

Converts a black and white 'scan' -- or other linework without transparency, to a layer with transparency corresponding to white in original image and black to solidity, with intermediate brightnesses translating to intermediate levels of solidity of black.

In short -- converts white -> transparency, black -> solid, with full antialiasing.  read more »