blue/green screen key Nuke

Primatte - Apply Primatte node to foreground to get alpha. - apply HueCorrect to original. - input it into Copy node. - input alpha from Primatte to Copy node. - Pre-multiply it. IBKeyer - apply IBKColour to foreground. - input it into IBKGizmo as color. - input original into IBKGizmo as fg. - adjust parameter to get good edge. - merge it with bg plate. - add Grain node to the bg plate. - Shuffle node to priginal to get only one node. - Grade node to make bg black and hair white.(if hair is darker than bg, do the opposite.) - Merge node with bg plate in plus mode.(use multiply mode) - add another IBKGizmo with the same IBKColour - Keymix with 1st IBKGizmo inputA - Roto hair out of inputB as mask