there tyre tread dds is for the treads only not colour. and theres another for the colour aka the rubber colour but if you edit it all tyres would have the same mark i think?
I have tryed to do this already but since the tyre color in the dds file are white and if you try to put a white line in one of the groves lfs will just make it black for some reason.
That's because it's a bumpmap. A bumpmap creates the illusion of depth on a surface. the white parts are the normal "height" of the surface, the black parts indicate which parts should appear to be of lower height. This is then processed by for instance a game to fake depth. So it has nothing to do with colouring the tyre.
And there's no other file that controls the rubber colur, like I said it's vertex colored.
The closest i've managed to get is a pale blue line and it's the same for all compounds, but do not despair as before the season Bridgestone's original suggestion was a red tyre wall, but the FIA did not respond in time about the whole hard/soft tyre compound concept and so Bridgestone were not able to put the production facilities in place.
I think the plan is still to use a red tyre wall, but they wont be appearing until later in the season.
What joen described is exactly how a bump map works. An alpha map would make parts of the tire invisible(by altering the alpha value).
The story I heard was that Bernie got word that the americans use red tires for softs, and then didn't allows bridgestone to do the same thing in f1. Instead we got the dot.