Then select the duplicated layer and goto Filter->Artistic->Poster Edges. Use the default settings.
Now the wood is starting to look somewhat realistic, but its not quite a there yet. The problem is that the photoshoped wood is too perfect (more noticable with a larger sized picture). Real wood has knots, wane and other irregularities in it.
Goto Filter->Liquify
The best way I have found to create the knots with the liquify filter is to take the following steps
- Select the spot to create the knot
- Use the nudger tool to create push out the wood texture on both sides of the spot you selected
- Then use the spiral tool in a slight up down motion to create a realistic knot.
Then you should have your result, a nice realistic wood texture
