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Alex Lindsay's explanations of AE's Color Difference Keyer (a sample from the Composite Toolkit) will feed your head and help you understand some of what goes on behind the scenes in keying filters.Fxguide's 'Art of' Keying (history and survey to 2005) & more.A personal observation under a deadline - duplicating a layer with a-bit-too-aggressive key on hair can help give the hair some extra blending detail.Amidst other advice Adam Wilt says use Chroma Smoothing in Final Cut, as quoted in an AEP post Jaggies on Chroma Key.9 Tools for live chroma keying, from Topher Welsh.Tutorials on 'super tight' garbage mattes in After Effects.Toolfarm later added In Depth: Keying: Introduction & Frequently Asked Questions about Shooting Greenscreen and In Depth: Keying: Pre-Processing Greenscreen Footage for Keying.Video training on Keylight and a greenscreen book from Toolfarm.
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A small portion of his info was released in book teasers, Color Keying in After Effects CS3 and a video presentation of Keylight.