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image-tile imgprocedure
image-tile! imgprocedure
image-tile-horizontal imgprocedure
image-tile-horizontal! imgprocedure
image-tile-vertical imgprocedure
image-tile-vertical! imgprocedure

Adjust img in such a way around the edges, such that it is suitable for use in repeating ("tiled") patterns on all sides, only horizontally or only vertically.