Grass Valley Indigo AV Mixer v.1.2.2 - Manual (Page 51)

INDIGO AV Mixer User Manual 51
Video Processing
Key Invert
Keys can be inverted, causing holes to be cut in the background where
a normal key retains the background, and vice versa. Key invert makes
the white areas of the key cut signal produce transparency, and the
black areas produce opacity, the opposite of a standard key.
Border
The Border feature generates borders around keys. The key signal is
delayed and/or enlarged, and the extra bordering space can be filled
with matte. Border can be adjusted in size and in horizontal and ver-
tical placement. Variations include Outline, Extrude and Drop.
Opacity
The opacity of a key can be adjusted. When opacity is reduced below
100% some background video is allowed to show through areas where
it is normally excluded. Key opacity is an adjustment to the overall
intensity of the key and is separate from Clip and Gain controls. Note
that a common mistake is to set opacity to zero and forget that adjust-
ment was made, which can cause confusion later when that key is
selected but not visible.
The INDIGO AV Mixer supports the following types of keys:
• Luminance Key
• Chroma Key
• PiP (Picture in Picture)
Two of the keys, Luminance Key and Chroma Key, are described in detail in
the following.