This filter is a script-fu and not GEGL-based.
This filter is used to soften tile seams in images used in tiled backgrounds. It does this by blending and blurring the boundary between images that will be next to each other after tiling.
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If you want to treat only images borders, you can't apply filter to the whole image. The solution to get the wanted effect is as follows:
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The bigger the radius, the more marked is the blur. By selecting Horizontal and Vertical, you can make the horizontal and vertical borders tileable.
These options are self-explanatory.
Choose the algorithm to be applied:
for photographic or scanned images.
for computer-generated images.