AndreasOberg wrote:On another note. How would I convert an RGB image to a matte/alpha? I would like to take the luminance from a color image and "convert" it into an "alpha"/matte so that I can mix it with my other mattes I have.
You can pipe a desaturated color output from one node to the mask input of another node and you effectively get an alpha channel.
What I prefer to do when mixing alphas is the reverse: pipe the alphas into color inputs and then use layer mixers / normal color tools to manipulate them before piping the result back into a mask input / clip alpha out.
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