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Section 2— Control Panel Descriptions
Background suppression removes traces of the chroma key
background color from the foreground. The BKGD SUPR button
turns background suppression on or off. When suppression is
turned on, the associated control knobs are used to define the
amount of suppression.
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. This knob will beep when the chroma has been
suppressed to zero (at a linear chroma key location).
The CLIP knob in the keyers subpanel also will indicate when the
chroma key has reached a linear level. In terms of the chroma key
this indicates that the foreground part of the scene is just opaque.
Only readjust this setting when parts of the foreground are
transparent where they are picking up background color.
The
Auto Setup button causes the switcher to automatically set up
the chroma keyer. To do this press the Auto Setup button. This
causes the chroma keyer to take over the wipe positioner knob
and puts a cross hair on the chroma key layer of the output. Use
the positioner to place the cross hair on the background you wish
to key on and press the Auto Setup key again.
Bkgd
Supr
Lum
Chroma
Auto
Setup