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This Python plugin swaps pixels across a path, ie, it takes the color of a pixel on one side of the path and exchanges it with the color of a diametrically opposed pixel from the other side.

Uses

TBD

Installation

Get the python module here and copy it to your Gimp plugin installation directory, normally, either:

• {your Gimp installation directory}/lib/gimp/2.0/plug-ins

  for a public installation (available to all users)

• {your user profile}/.gimp-2.6/plug-ins

  for an individual installation (on Unix systems, the .gimp-2.6 directory is not displayed by default in file managers).

On Unix platforms, don't forget to set the executable bit (this requires root priviledges if you do it in the Gimp installation directory).

Once GIMP is started (or restarted) menu entry should appear as

Filters/Noise/Swap pixels across path...

Usage

This plugin requires an active path (the selection can be changed into a path)

There are three parameters are required:

• Width: the distance on either side of the path where pixels can be affected.
• Density: an indication of the number of pixels to swap. A density of 0 swaps one pair of pixels per pixel of path length. A density of 100 swaps width/2 pairs.
• Spread: The "Linear" spread makes pixels be picked at a linearly random distance from the path (ie, those close to the path are as likely to be picked a sthose far from the path). The "Quadratic" setting favors the pixels closer to the path (those in the first quarter of the width are as likely to be chosen that those in the 3 other quarters)

If the path has sharp angles, the exterior of such angles can be left unaffected. In other words, avoid sharp angles. If the path comes from a selection, you can blur the selection before changing it to a path, and still apply the filter on the sharp data.

Notes, warnings, and miscellaneous small print

Contacting the author

I can be contacted via the GIMP plugin registry.

Otherwise I also hang out on:

• The Gimp-user and gimp-developer mailing lists
• The comp.graphics.apps.gimp newsgroup
• GimpForums
• GimpChat

Warranty

This plugin has been developed on Linux, so its correct behavior on other platforms (Windows, OSX) although expected, is not guaranteed.

This plugin is for GIMP 2.6. Tests on 2.7 gladly accepted.

This plugin can be a CPU hog with long enough paths and a wide enough area.