luma keying for specified rotoved in the image

[Nasi]

I already used luma keyer to the image and I want to mask section of the image with roto . how can I do this in nuke

[oyvind]

Attach a roto-node after the keyer and set it to paint only on the alpha-channel. Premult after that.

[kyrgr]

http://www.vfxtalk.com/forum/luma-paint-t33389.html
I think it's the same question.

[Nasi]

NOw I realized , thanks dude.....................