NewTek TriCaster TC1 (2 RU) - Manual (Page 157)

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When good distance is out of the question, you can improve things somewhat by placing lights above and
b
ehind the talent, lighting them from behind with a complimentary color filter over the light to ‘cancel out’
unwanted reflection (for green use a magenta filter; for blue, orange or amber.
Don’t overdo back (or top) lighting, however. The limited dynamic range of the camera means there will be
little useful color data in badly over-exposed highlights. This can make it next to impossible to separate
fringe zones (such as hair detail) from the background (especially when this is also overexposed).
SECTION 13.7 CROP SOURCE
FIGURE 171
We discussed this feature back in Section 0, but wanted to bring it up again in our discussion of LiveMatte. It
is common for unwanted items to remain after chromakeying.
Common examples include microphones or lighting fixtures dangling from above, or perhaps a harsh crease,
blemish or tear in the background screen.
Crop Source , located in the Image tab just below LiveMatte , can
serve as a ‘garbage matte’ to remove this sort of intrusion.