This new Photoshop technique will allow you to remove any erratic, chaotic background patterns, caused by old printing machines ('random dotted pattern') or visible paper structures (fibers, depths), with the least possible blur. Note that there are various methods for recovering halftone prints from newspapers or color magazines (with the fast fourier transformation method) covered elsewhere. The images have in common that they show at the highest zoom a kind of chaotic leopard pattern. What you would like to do is to lighten the spots, and darken the background, so that they merge to a uniform color. The difficulty is to get a selection that is exactly right.