Create a seamless tileable texture

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Gimp is the only tool you need. It has two powerful filters.

First, take an image of your material. For example, this is a scan of an ISOPLY sample.

ISOPLY.JPG

Tile this image 4 times with the Gimp filter "Map -> Small tiles" ("Carte -> Petit raccords" in french) We can see seams between each repetition. It's not so beatiful.

ISOPLY-smalltiles.jpg

Thus, you would rather blur the image sides to make it tileable without seams. Use the Gimp filter "Map -> Tiler" ("Carte -> Rendre raccordable" in french)

ISOPLY-tiler.jpg

And then tile it again to look if the result is good.

ISOPLY-tiler-smalltiles.jpg

As you can see, we don't see seams anymore. But there is still a dark piece which bump into our eyes. You should take care your image has not a too constrasted area to avoid this effect.