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Bump Mapping Tutorials

Posted: June 20, 2012
3d artist gallery Andyba
from: http://en.wikipedia.org/wiki/Bump_mapping
Bump mapping is a technique in computer graphics to make a rendered surface look more realistic by simulating small displacements of the surface. However, unlike traditional displacement mapping, the surface geometry is not modified. Instead only the surface normal is modified as if the surface had been displaced. The modified surface normal is then used for lighting calculations as usual, typically using the Phong reflection model or similar, giving the appearance of detail instead of a smooth surface.

Here is a bump mapping tutorial for Photoshop.