Grass Valley 1200 Operation Manual - Manual (Page 67)

3-21
Keyer
Preset Pattern
The [PRESET PATTERN] button enables a wipe pattern to cut the key
hole and assigns the Key bus to provide the fill video. Note that
preset patterns and wipe transitions share the pattern generator.
Changing the wipe pattern changes the preset pattern also.
When you select [PRESET PATTERN], the Matte and Pattern
controls delegate to preset pattern adjustment. You can use these
controls to select a pattern, invert the key, set pattern position
(joystick), pattern (SIZE), edge (WIDTH), edge (SOFTNESS), and edge
softness (SYMMETRY). Additional adjustments are available in the
Wipe menu. Using the Matte controls, you can adjust the pattern
edge luminance (LUM), saturation (SAT), (HUE), and (KEY OPACITY).
Key Modifiers and Adjustments
Key modifiers and adjustments are listed and explained below.
Additional modifiers and adjustments not listed here are
available in the Keyer, Chroma Key, and Wipe (Preset Pattern)
menus.
Key Over
The [KEY OVER] button, when activated, places the currently
delegated effects key layer on top of the other effects key layer.
Invert
Selecting [INVERT] inverts the polarity of the key source. For a
luminance or linear key this enables the dark areas of the source
to cut the key hole rather than the light areas, which is helpful
when keying from dark images on a light background.