getting alpha for painted area ?

Hi

how to get the alpha for painting area in nuke with using roto paint tool,

i am getting with a little process, (its working on in Nuke6.1)

copying rotopaint node
and attaching the constant in BG1 place in rotopaint node
and changing all strokes source to background1
and adding shuffle copy

in this way i am getting alpha channel for the painted area, but is there any simple process to get the alpha channel for the painted area?

Advance Thanks

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