GIMP Script-fu
sg-mirror-dup
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Command:
Mirror
Menu:
"<Image>/Filters/Map/Mirror..."
PDB Name:
script-fu-sg-mirror-dup
Download:
sg-mirror-dup.scm (after the page appears, click on the "Download" command)
License:
GPLv2+

Description:

This script will increase the size of the image by creating mirror images of it and placing them to the side and/or underneath.

WARNING: This script grows the size of the image exponentially! If you perform more than just a few iterations and your starting image is not small, it is very easy to run out of memory.

The following images show some results achieved by the script.

Original Image

Mirrored Horizontally

Mirrored Vertically

Mirrored Both Horizontally and Vertically

Mirrored Multiple Iterations