GPLv3

Adjustment Layer Script

elsamuko — Fri, 13 Nov 2009 18:44:22 +0100

This script generates two adjustment layers from the two layers on the top, A is the original image layer, B the modified (e.g. sharpened) one on top:
A - B = C
B - A = D
A - C + D = B

Now you can apply further editing and "switch on/off" the adjustment by switching the visibility of the subtractive and the additive layer. Also you can change the modification intensity by changing the intensity of these two layers.

Copy it into the scripts folder from GIMP, you will find it then under Layer -> Adjustment Layers:
http://docs.gimp.org/2.6/en/install-script-fu.html

Example image:
http://www.flickr.com/photos/28653536@N07/4113253102/

Left: B A
Right: D C A B

Finally a big thank you to Shelly and Roy from the Flickr GIMP group:
http://www.flickr.com/photos/shelly-and-roy/

Quadrupole

theilr — Thu, 12 Nov 2009 05:26:01 +0100

Takes an image, makes four 1/4 scale copies, and reflects them about vertical and horizontal axes to achieve a four-fold symmetry.

Note: As well as being atrociously inefficient (eg, by scaling the same image four times, instead of making copies after the first scaling), this code does substantially less than the "Small Tiles" dialog (which comes standard in Gimp in /Filters/Map)

Cheap HDR

theilr — Thu, 12 Nov 2009 05:05:32 +0100

Provides a kind of poor-man's HDR (high dynamic range). It doesn't actually increase the dynamic range; in fact, it decreases it, overall, but in a way that maintains local contrast. But this gives you some headroom to increase the contrast of the image overall, thus enhancing the local contrast.

Jagged Border

theilr — Thu, 12 Nov 2009 04:48:18 +0100

Creates a white (or black) border around an image that merges in with the image so that on a larger white (or black) background, the image appears to have a ragged border. This is similar to the Gimp's Fuzzy Border, but it adapts its jaggedness to the image. (Also unlike Fuzzy Border, it is deterministic, it does not depend on random number seeds.)

Some examples of what I mean by a jagged border that "adapts" to the image, which also illustrate the difference between a white and black border (it's not just the color), are shown in this triplet of images:

http://www.flickr.com/photos/theilr/4102672801
no border

http://www.flickr.com/photos/theilr/4103434084
white border

http://www.flickr.com/photos/theilr/4103433020
black border

An example (with a short animation) that shows how they are created:
http://www.flickr.com/photos/theilr/3644571097

Spaced V-Guides

jboulais — Fri, 16 Oct 2009 15:55:12 +0200

This script creates a series of V-Guides in the image at the user defined spacing. The user also specifies if the guides should start from the left, center, or right side of the image.

Spaced H-Guides

jboulais — Fri, 16 Oct 2009 15:53:38 +0200

This script creates a series of H-Guides in the image at the user specified spacing. The user also indicates if the guides should start at the top, center, or bottom of the image.

Border Guides

jboulais — Fri, 16 Oct 2009 15:51:49 +0200

A simple script that creates guides to border the canvas. The user is prompted for separate X and Y offsets.

Center Guides

jboulais — Fri, 16 Oct 2009 15:50:12 +0200

A simple script that creates a horizontal and a vertical guide at the center of the image. The script is found under "Image | Guides".

PAL and PAL VHS filters

kecskebak — Mon, 05 Oct 2009 06:29:02 +0200

A couple of Python-Fu filters for making images look like they have been PAL encoded or retrieved from a VHS tape. The plug-ins will scale any image they are fed to 720 x 576 - this is because that's the size PAL images are.

PAL images have non-square pixels - if you want to correct the aspect ratio afterwards you can scale them to 788 x 576.

Palette to Image

cr33dog — Wed, 16 Sep 2009 21:21:52 +0200

Palettes Menu -> Palette to Image

Take the active (selected) palette and create an image containing the colors and their names. Requires python.

Options:
- Font: pick the font for the name listing
- Size: size of each color

Tested with 2.6 and linux, but should work cross-platform.

TODO: it's hardcoded to a minimum of 200px wide - I should change that to something more reasonable. Some nice additions would be bg and text color selectors, and possibly some layout options (spacing, columns, etc.)

Have fun ;)