Grass Valley 1200 Operation Manual - Manual (Page 66)

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Section 3 — Controls & Menus
Luma Key
Selecting [LUMA KEY] produces a high gain key with key edge
shaping. Luminance keys are generally used when keying from
video. The fill and source are taken from the Key Bus.
Adjustments and modifiers include (CLIP), (GAIN), (KEY OPACITY),
[KEY MASK]
, [KEY INVERT], optional Borderline edge effects, and
additional adjustments in the Keyer menu.
Chroma Key and Auto Setup
Choosing [CHROMA KEY] activates the optional chroma keyer and
the Chroma Key menu. The chroma keyer removes a user-selected
color from the Key Bus fill video, producing a key effect that
consists of background video where the color used to be and fill
video everywhere else. Note that the chroma keyer can be used in
only one keyer at a time. If it is in use in one keyer when you select
it in another keyer, the key type lamps turn off and the key layer
is forced to be transparent.
When [CHROMA KEY] is on, you can select [AUTO SETUP], a feature
that provides fully automatic adjustment of the chroma key.
When [AUTO SETUP] is on, a cursor appears on your Program video
monitor. You may then use the joystick to position the cursor over
the color you wish to key out, and press the button on the top of
the joystick to select that color. The switcher automatically adjusts
the chroma keyer to produce an excellent chroma key based on the
color you select, and the [AUTO SETUP] button turns off, indicating
that auto setup has been accomplished. To turn off [AUTO SETUP]
without selecting a color, just press the [AUTO SETUP] button again.
You can also adjust the chroma keyer controls directly if you
choose to. Adjustments and modifiers include (CLIP), (GAIN), (KEY
OPACITY)
, [KEY MASK], [KEY INVERT], and a number of controls in
the Chroma Keyer menu, including a dedicated chroma key box
mask. (See the menu descriptions later in this section.)