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To start, create a new image with a plain, mid-grey background. Next, run the mosaic effect on it - increase the tile size to about 20 and the grout width to about 6 before applying though. You should end up with something similar to the picture on the left. If your favoured program doesn't have a mosaic filter, you can simulate the effect by drawing a semi-regular grid in a darker grey across the picture. |
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Next apply the charcoal effect. This should leave you with something like the picture on the left. We are now only one step away from having cobbles... |
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Finally, invert the image! And there you have it, a reasonable stone cobble effect. |
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An undulating cobbled surface can be achieved quite easily, using a different start picture. Try this: create a series of plain white-to-black blobs. (See the blob tutorial if you aren't sure about how to do this.) Then apply the mosaic effect as before, but decrease the grout brightness. |
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Apply the charcoal effect, and invert the picture again. This should give you something like the picture on the left. See how it makes our stone surface look less even - just like your average cobbled road! |
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