Sony DVS-9000 User Manual page 206

Key drop ON mode: The key fill/key source position moves downward by
Key drop OFF mode: The key fill/key source position does not move. When
In the key drop ON mode, a menu setting selects between the mode ("4H
mode") in which the key fill/key source position is lowered by four scan lines,
and the mode ("8H mode") in which the key fill/key source position is lowered
by eight scan lines.
When Fine Key is on, the edge width is forced to the range 0.00 to 4.00.
Note that in the following situations, the key drop mode is forcibly turned on.
• When the edge type is border, outline, or emboss
• When the edge type is normal with soft edge being on
• When Fine Key is on
Edge fill
When a border, drop border, or shadow modifier is selected, you can select a
signal to fill these edge effects.
The edge fill may be either the signal from the dedicated color matte generator,
or the signal currently selected on the utility 1 bus.
In the case of an outline, there is no edge fill signal selection, because the key
fill signal fills the outline, and the rest of the image remains as the background.
For the emboss effect, in place of the edge fill signal, the emboss fill matte 1
and emboss fill matte 2 signals are used.
Masks
A mask is used to inhibit the effect of a key over a part of the image. This
allows parts of the background which would otherwise be keyed to be
protected, or to correct the key if it is not of the desired shape.
For details of masking operations, see "Masks" (pages 229 and 246).
Key mask and background mask
There are two types of mask: a key mask and a background mask.
Key mask: This masks out a part of the key, which will result in the
206
Overview
eight scan lines or four scan lines. When a drop border or shadow is
selected, it is possible to apply a border to the top edge of the key.
a drop border or shadow is selected, it is not possible to apply a border to
the top edge of the key.
background appearing.