To create photo engravings is not very simple. First of all, the blasting foil must be created. To do this, the motif is converted into a black and white image using a computer program (e.g. Photoshop) and then into a halftone photo. Since it is not possible to create gray scales in engraving, these are suggested by the dot density. Once the beam motif is finished, a negative image is created and printed on a transparent film. The printed foil is then placed on the blasting foil and both foils are pushed into a UV exposer. For a few seconds, the blasting foil is irradiated with UV light. The blasting foil is then washed out with water and dried again. The material is destroyed by the UV light at the points where it is to be blasted.
Finally, the finished blasting motif is given a protective film at the top and bottom so that it can be transported without any problems. Many stonemasons have the motifs created, as they do not have the necessary equipment themselves. Once the foil is ready, blasting can begin. For this purpose, the lower protective layer is removed from the foil, the stone is slightly moistened and then the foil is placed on the stone and pressed on with a rubber roller. Finally, the upper protective film is removed and everything that must not be blasted is masked off.
Then the blasting starts. As a rule, very fine corundum is used. The film is blasted until the desired depth is reached. The foil is then removed. To enhance the contrast, the motif can be painted over.