Grass Valley 1200 Operation Manual - Manual (Page 98)

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Section 3 — Controls & Menus
Chroma Key Force Mask Menu
From the Chroma Key top menu, press [FORCE MASK>] to display
the Chroma Key Force Mask menu shown in Figure 3-22. This
menu controls the chroma key box mask, allowing you to apply it
to the background or foreground suppression to turn off the key
in selected areas.
Force Mask Menu Functions:
[BKGD MASK] —Turns background suppression mask ON or OFF.
When ON, the mask forces the key off, preventing keying in the
masked areas. For example, if a person in the chroma key scene
has blue eyes (assuming a blue keying color), his or her eyes will
need to be masked to prevent them from keying.
[FGND MASK] —Turns foreground suppression mask ON or OFF.
When ON, this function prevents foreground suppression in the
masked areas of the foreground. For example, a foreground object
may be the same color as the color you are trying to suppress in
another part of the foreground. You can prevent suppression of
the object using the mask.
[INVERT MASK] —Inverts the mask. Normally, the area inside the
mask box is masked. When invert is ON, the area outside the mask
box is masked.
[JOYSTICK] —Turns joystick positioning of the mask ON or OFF.
(SIZE) —Adjusts size of the mask shape.
(ASPECT) —Adjusts aspect ratio of the mask box.
(SOFTNESS) —Adjusts softness of the mask edges.