Grass Valley Zodiak v.6.0 Mar 15 2006 - Manual (Page 411)

Zodiak — User Manual 411
Chroma Key Operating Notes
3. When making this adjustment, it is helpful to turn the secondary Chroma
Suppression to maximum, and the secondary Suppression Angle to produce
an unnatural color in the affected area. This makes the changes to
secondary suppression more obvious.
4. Selectivity should be kept as wide as possible. You should only narrow
selectivity (increase its value) if you cannot avoid changing opaque
areas of the foreground.
5. Adjust the secondary Angle so that changing secondary Chroma
suppression moves the color in the desired direction. You are trying to
match the color of the translucent areas to an opaque (uncorrupted)
area of the foreground subject.
6. Decrease secondary Chroma suppression for the best match between
corrupted (translucent) and uncorrupted (opaque) areas. Interaction
between secondary suppression
Angle and Chroma suppression may
require repeating these adjustments.
7. Increase secondary Luma suppression to balance lightness of the
translucent and opaque areas.
8. Repeat secondary suppression Angle , Chroma suppression and Luma
suppression for best results.