Tutorial from xrayjay from this address: http://www.maniapark.com/forum/viewtopic.php?f=85&t=22211
Since we need NormalMaps (a kind of BumpMap in Nadeo games) for mods / objects etc. i will show you how you can make em very easy.
It´s that file at the objects with the Filename_N
what we are doing here, for mods it´s similar.
filter
menu in ps, there have to appear a new point in the menu named NVIDIA Tools
.Now it should look like this (i used an example texture here)
If you got some layers you need to reduce em to one background image (save your work as psd before)
Just right click on the bottom layer and choose there "reduce to background image"
Just go to your filter menu and choose there the "NormalMapFilter"
The following window appears:
You just need to do some configurations here:
Upper left you can see here a little preview how your file will look like.
Check the other configs that they are the same like in the image here.
Hit OK
to confirm this.
That´s it!
Go to file>save as> choose here dds as output format and the following window appears:
Check if you got the same configuration like here on this pic:
Set as image option Normal Map: Tangent Space
Confirm this step with ok and now we´re ready to save our image.
Just hit the Save
button and your dds file will be created.
We are finished, that´s all, really easy ;)