Professional photographers pay big bucks to have their photo labs give portraits an "old masters" look by cracking the surface as if it were a painting that had started to age. Paints used in ancient times weren't stable, as they were egg whites, clay, and plants used as pigment and used a protective varnish layer that tended to crack. Pro photographers sometimes have this texture applied to their photographs to give them an Old Masters patina. You can achieve a similar effect, which adds a nice 3D look, using the Craquelure filter.
Your controls can specify the crack spacing, depth, and brightness. You can adjust the spacing to produce a mixture of cracks and image area, and modify the depth and brightness settings to create deeper or shallower cracks.
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Although we usually tend to think of the digital camera as the best thing since sliced bread, there are both pros and cons with its use. Nothing is available on the market that does not have both a good and a bad side, but the key is to weigh the good against the bad in order to come up with the best of both worlds.