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Section 2 — Control Panel Descriptions
The BKGD SUPR LUM control adjusts the amount of luminance
subtracted from the background region of the foreground video.
The BKGD SUPR CHROMA control adjusts the amount of
chrominance subtracted from the background region of the
foreground video.
Chroma Keyer Operation
The following procedure describes manual adjustment of a
chroma key. Automatic adjustment is provided by the Chroma
Key Auto-Setup Option.
The chroma keyer performs the fundamental suppression
operation by subtracting mattes from the foreground. This results
in a shaped foreground without a multiply operation. The
primary hue selector chooses the hue to be subtracted out of the
foreground. Chroma is subtracted off first, followed by a
luminance subtraction.
NOTE:
Adjustment of chroma keys is aided by having a waveform
monitor mounted in or near the control room console.
1. Select CHR KEY on the appropriate Keyer panel.
2. For an RGB chroma key, select AUTO SEL on the Keyer panel;
for an encoded chroma key (with a Decoder board installed),
select VIDEO KEY on the Keyer panel.
3. Select the chroma key source on the KEY bus.
4. Bring up the Chroma Key menu by pressing the main menu
CHR KEY
button.
5. Set BACKGROUND VIDEO to OFF and set FOREGROUND
CORING
to FIXED in the Chroma Key menu.
LUM
CHROMA