On Wed, 2010-03-03 at 20:30 +0000, andy baxter wrote:
> andy baxter wrote:
> > Hi all,
> >
> > I've just found a neat way to use enblend to make seamless tiles.
> >
> > All you need to do is:
> > - take an image you want to make seamless.
> > - crop it to a shape with an even number of pixels in both directions.
> > - open the image in the gimp and double the canvas size with the
> > original image in the centre.
> > - make 4 extra layers with the image displaced to the top left, top
> > right, bottom left and bottom right.
> > - save all 5 images (including the one in the centre) as tiff files.
> > - run enblend on them.
> > - crop the result back to the original size and save it.
> >
> > This produces a seamless tile which can be saved as a pattern. See :
> > http://ganglion.me/media/metal-repeated.jpg
> >
> > for an example of how it looks.
> >
> > andy
> >
If you use a high pass filter on the image before doing this, the tiled
image won't have bright and dark diagonal lines. The Gimp doesn't have a
built in high pass filter, but you can get the same effect like this:
1. Flatten the image if it is not already a single layer.
2. Duplicate the layer.
3. Gaussian blur the top layer with a large radius.
4. Set the top layer's blending mode to grain extract.
5. Flatten the image again.
Since this will remove the overriding colour of the texture, add it back
in using colour balance, levels, or colour curves.
> P.S. I just tried it on a more difficult pattern (irregular stone bricks
> in a wall), and it doesn't work nearly so well.
>
> http://ganglion.me/media/bricks-repeated.jpg
>
> andy.
You can make tiles with Enblend for some strong patterns by
straightening the image with Hugin and cropping the image at measured
points. This is easy for regular bricks, but I don't think it will work
with irregular stone bricks. The Texturize plugin for the Gimp might be
worth a try:
http://gimp-texturize.sourceforge.net
-James
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