4 comments on “Advanced Keying Breakdown – ALPHA 1.1: pre-processing the GS

  1. Thanks, mate. Valuable input, especially that IBK stacking. One thing that worked for me was decreasing the saturation of the footage (before IBK colour and IBK gizmo) down to 0.5, sometimes even 0.25(don’t go below that). and then adjust the alpha channel using a color lookup curve, usually just creeating an S-curve for both black and white point. This will create big holes in the core of the matte, but will get fine details like hair.

    • Shuffle nodes are for rearranging channels, typically RGBA, or Red, Green, Blue, and Alpha. You can do stuff like switching the red and green channels to making interesting images. In this case I am just telling all of the channels to become the Alpha Channel, meaning RGB and A will all look the same (the alpha). This saves me time of having to keep switching to “alpha view” in my viewer when I switch back and forth between the original plate and the key alpha.

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