Hi:
The easiest way to do that (basic) is converting actual texture to grayscale and then play with contrast and brightness, so in photoshop will be something like this:
- Open texture
- Duplicate Layer (background)
- Manual Grayscale = Edit>Fill>50% gray
- Image>Adjustements>Brightness/contrast
- Play with values
To do "N"ormal map (_"N".dds) files, the easiest way to do that with photoshop/Gimp is the Nvidia plugin to make the grayscale/diffuse layers in normal map layers (nvidia normal map filter), there are other external tools like crazybump, but most of them are not freeware.
If you use Nvidia plugin, be sure to check this:
Height Source = Average RGB
Alpha Filed set to 1.0
4 samples
Filter checked
Add Height to Normal Map
Play with SCALE Value
If you want for example add more depth manually (more detail) you can try something like this:
- Duplicate actual layer (normal map layer)
- Add Gaussian blur (filter>blur>gaussian blur) with small value, something like from 0.2 to 0.7
- Change Blending mode to Overlay
If you want much more detail, simply duplicate layer and play again with blur oo duplicate again to increase more detail.
Nvidia plugin download
http://developer.nvidia.com/object/p...s_plugins.html
Bye !!