Nuke Expressions Node

[Anonymous]

Hi,
I Trying RGB & CMYK Matte Need To Extract Color and Convert to Cmyk to Rgb
I Convert to Cmyk to Rgb and Extract Rgb
i using Expressions node in nuke getting some problem in my Expressions
i need Alpha Expressions to help to comp,help in my Alpha Expressions(Using only Signal Expressions node )
Please Refer this IMG
http://www.freeimagehosting.net/g1tap

Thanks,
Rajesh Suralkar

[Aaron Sorensen]

For the one on the left you could try..
r+g+b==3?0:a
EDIT: to remove the other outer parts you could do this..
r+g+b>2?0:r+g+b<2?0:a

And the one on the right..
r+g+b>1?0:a

[Author]

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