Given three layers stacked A, B, C, is it possible to use the luminance of layer B to control the compositing of layers A and C? For examples, areas of greatest luminance allow layer A to come through, while areas of low luminance show layer C (with a range of possibilities in between).
thanks,
Michael

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You could set the alpha channel of layer 3 with the contents of layer 2, then mute layer 2 and use replace composite on layer 3 with alpha view enabled.

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