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How to Create a Matte from GreenScreen in Nuke

1. This note is how to create a matte from a Green Screen shot. You would do this if there was no alpha channel provided for the foreground

girl no_alpha

 

2. Get green channel and red channel from the the GreenScreen

GB_channel

3. Get Merge Node, using Minus to subtract from Green to Red

subtract_node

subtract

 

4. Add Grade Node and lower your whitepoint for the background. In this case it worked with the value 0.055

grade_node

grade

 

5. Add Invert and Clamp

final_node

6. Final Image

final