Basically, you need Photoshop and the nVidia DDS plugin. When resaving as a DDS file, it'll come up with a little dialogue giving you all the options you need. Firstly, you'll obviously want to select "Generate MIP maps", if you haven't already, then click MIP map filtering... and select 'Catrom' under filter type. Note that this isn't strict, but it was just the filter that was used when I found out about this method, and it seems to work fine for me. Feel free to experiment, if you've really got the time or patience! Then click Sharpening... and choose 'Sharpening Soft' under the filter drop down menu (again, feel free to experiment). Save the DDS file.
First, textures with no MIPs on my video card - quite obviously suffering from jaggies, around the doors/markings, etc:
Now, two textures on the same aircraft - on the left is the sharpened MIP DDS, and on the right is the non-sharpened:
Not only does the texture on the left bring out more detail (and get rid of those jaggies), but it also seems to reflect the light better, and there's a pretty clear line that runs down where the light reflection just suddenly goes dull. The difference in sharpness is pretty obvious along the RAAF text.
I hope this helps anyone who's been suffering with the same problems as I have!
