This type of granite photo engraving method uses a machine with a diamond-tipped head connected to a computer with special software. The impact-etching machine is placed over the top of a piece of granite and creates a photo engraving by driving a diamond needle into the stone.

The machine engraves an image based upon a photographic image loaded from a computer to the machine. An impact-etching machine reproduces a close replica of the original image with the quality of an artist's engraving.

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