probably 1-max(r,g,b) and something else
anyway here's one I made earlier (about 8 years ago)
http://www.nukepedia.com/colour/secondarycolourtools/
You can gleam the maths from that
Cheers
Howard
>________________________________
> From: rajesh suralkar <[email protected]>
>To: [email protected]
>Sent: Monday, 18 February 2013, 11:46
>Subject: [Nuke-users] Nuke Expressions Node
>
>
>Hi,
>I Trying RGB & CMYK Matte Need To Extract Color and Convert to Cmyk to Rgb
>I Convert to Cmyk to Rgb and Extract Rg b
>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
>www.freeimagehosting.net/64db6
>
>
>
>
>
>Thanks,
>Rajesh Suralkar
>
>
>Dear nuke-users! Get Yourself a cool, short @in.com Email ID now!
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