This process is capable of reproducing black and white halftone images and line-art with incredible detail. An experienced engraver can engrave text as small as 9 points or a line as small as .5 of a point. A photographic image is reproduced at a 65 line screen, the equivalent to an image in the newspaper. The image is permanent because it is engraved into the surface of the stone. The effect that makes the image highly visible is the contrast of the reflected light from the engraved stone to the smooth finish of the uncut stone.
Black granite provides the best surface for photo engraveture.
The grain structure in selected black granite is very fine, providing a superior background for details. The size of an engraved project depends on the ability to handle the large pieces of stone. Several panels can be used together to create a large project. Many other types of stone can be photo engraved, including limestone, marble and also glass. Photo engraving on stone requires a smooth finish.