I would like to use a textures alpha channel to alter the color of the texture. I have a wall and would like to use the alpha channel of the texture itself to grime up areas of it. I am sure this can be done with just a few nodes in the material editor but I just dont know where to start.
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For the record though, there's no real benefit to using the alpha channel over a greyscale mask texture unless you're running out of texture samples.
@oniram: look closer.
In this case the alpha is being used as a mask to modulate the diffuse with the other color.