In this tutorial we will create a simple wood texture. The result can be used in manually rendered artworks or as a 3D image map. For 3D modeling you can use the alpha channel created as a bump map.
Create a new document 800 x 600 pixels
Make a new layer and fill with light brown:
Texture / Grain
Grain Type: Horizontal
Blur / Motion Blur
It's already looking very woody.
We can now add a little shadow
Select all and copy layer
Create a new alpha channel and paste from the clipboard.
This creates a bump map for our lighting
Return to your layer and apply Filter:
Render / Lighting Effects
Light Type: Directional
Texture Channel: Alpha 1
White is high: Yes
Make the lighting path as shown.
Edit / Fade lighting effects:
Lighten or darken for different effects