GRASS VALLEY zodiak, Руководство пользователя

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376 Zodiak User Manual
Section 5 — System Operation
Chroma Key Operating Notes
The Zodiak system features chroma keyers with powerful controls. These
controls offer subtle adjustments to allow successful keying of difficult
subject matter (fine hair, smoke, translucent objects, etc.), and to overcome
some problems resulting from imperfect chroma key set coloring or
lighting.
Section 3 - Concepts of the Zodiak User Manual includes chroma key back-
ground information useful for understanding the chroma key controls. The
following information provides more detailed instructions on how to set
up a chroma key using the Auto Setup feature and the manual controls in
the Keyer menu.
Auto Setup
The first step of setting up most chroma keys is to use Auto Setup. Auto
Setup automates the first steps to achieving a chroma key. Auto Setup per-
forms the following:
• Calculates primary suppression Hue and Luminance.
• Sets primary suppression Selectivity and Chroma to defaults.
• Calculates Clip Low, and sets Clip Hi to default.
• Sets all the secondary suppression values to duplicate the primary sup-
pression values, but turns secondary suppression off.
• Changes Opacity temporarily to 100% to permit an accurate backing
color sample, and then returns it to its original setting.
• Sets Key Position and Size values to default (0).
Two different Auto Setup algorithms are available, one for well designed
and lighted sets (
Reshape
off), and the other for more challenging sets
(
Reshape
on). Depending on individual circumstances, additional manual
adjustments may be required after you use Auto Setup.
After an Auto Setup has been initiated, you can cancel it by pressing the
Auto Setup button again, but the chroma key will retain the default settings
imposed.
To Chroma Key Using Auto Setup:
1.
Press one of the
Key 1-4
Transition buttons on an M/E to delegate the
keyer you wish to use.
2.
Choose on the selected keyer’s key bus the chroma key source
containing the chroma key backing color.