How to make a material unaffected by the color picker?

[juicymelons]

I'm working on a car model with several materials. I want the color picker to work on the body of the car, but not on other parts (seats, wheels, etc).

I've searched around but can't figure out how to do this. Can someone point me in the right direction?

[dvaderv2]

Allegedly, you need to create an alpha channel for the textures.
Then you need to open up the alpha channel and paint over the areas you don't want coloured with black. Similarily, areas you want to colour should be painted over with white in the alpha channel.

[juicymelons]

[QUOTE=dvaderv2;35670595]Allegedly, you need to create an alpha channel for the textures.
Then you need to open up the alpha channel and paint over the areas you don't want coloured with black. Similarily, areas you want to colour should be painted over with white in the alpha channel.[/QUOTE]
Thanks! That solves that.