Grass Valley 1200 Operation Manual - Manual (Page 92)

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Section 3 — Controls & Menus
Chroma Key Fgd Suppress Menu
From the Chroma Key top menu, press [FGD SUPPRESS>] to
display the Chroma Key Foreground Suppress menu shown in
Figure 3-19. This menu includes adjustments to suppress
(remove) background color and noise that appears in the
foreground.
Foreground Suppress Menu Functions:
[FG NOISE SUPPRESS] —Sets the level of foreground noise
suppression to off, low, medium, or high. This removes noise
from the low chroma portions of the foreground video.
[FG COLOR SUPPRESS] —Turns foreground color suppression ON or
OFF . When ON, foreground suppression removes background
color that spills onto the foreground video. This unwanted color
may be the same as the background color (typically, blue or
green), or it may mix with a foreground color. For example, blue
spill may mix with red in the foreground, distorting the red to
magenta. Foreground color suppression allows you to suppress
this distortion, restoring the original foreground color.
[HUE ANGLE] —Delegates foreground suppression color detection
soft knobs as explained below. Two separate colors can be
independently detected and suppressed.
(FOREGROUND HUE SELECT ANGLE) —This soft knob appears
when [HUE ANGLE] is set to SELECT. It selects the hue in the
foreground that will be removed by the suppression circuitry.
This is useful for removing background color that spills onto
the foreground.
(SELECTIVITY) —Narrows or widens the range of hues selected
by the Foreground Hue Angle adjustments.
(FOREGROUND HUE SUPPRESS ANGLE) —This soft knob appears
when [HUE ANGLE] is set to SUPPRESS. When you adjust this
soft knob, you are selecting a second color to be suppressed in
the foreground. This is useful for removing variations of the
background color that occur when the background color
mixes with foreground colors.