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must be completely black, or it will color the background. 
You set clean mode in the Type menu for each keyer.
For details, see “Setting the Key Type” (page 110).
In the following situations, clean mode cannot be enabled.
• When key invert is enabled
• When the key fill is a matte
• When the key edge is an outline
• When the key edge is normal and soft edge is enabled
• When fine key is enabled
• When key positioning is enabled
Key Modifiers
Edge modifiers
You can apply borders and other modifiers to the edge of 
the key image.
Edge type and key fill/key source position
The key edge modification function has two modes: a 
mode (key drop on mode) in which the key fill/key source 
position moves downward, and a mode (key drop off 
mode) in which it does not move.
Key drop on mode: The key fill/key source position 
moves downward by 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.
Key drop off mode: The key fill/key source position does 
not move. When a drop border or shadow is selected, 
it is not possible to apply a border to the top edge of the 
key.
In 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 enabled, the edge width is forced into 
the range 0.00 to 4.00.
In the following situations, the key drop on mode is 
forcibly enabled.
• When the edge type is border, outline, or emboss
• When fine key is enabled
To fix key fill/key source to key drop off mode
Enable frame delay mode.
Type Description Video
Normal This is the state with 
no key edge modifiers 
applied.
 
Border Applies a border 
around the key. You 
can adjust the border 
width and density. You 
can also enable the 
separate edge 
function, and adjust 
the top, bottom, left, 
and right border 
widths separately.
Drop 
border
Applies a border 
below and to the right 
of the key, for 
example. You can 
adjust the border 
width, position, and 
density.
Shadow Applies a shadow 
below and to the right 
of the key, for 
example. You can 
adjust the shadow 
width, position, and 
density.
Outline Uses the outline as 
the key. You can adjust 
the outline width and 
density. You can also 
enable the separate 
edge function, and 
adjust the top, bottom, 
left, and right outline 
widths separately.
Emboss Applies an embossing 
effect around the 
periphery of the key. 
You can adjust the 
emboss width, 
position, and density. 
You can adjust the 
density separately for 
key fill and key edge. 
When embossing is 
enabled, the Fine Key 
and zabton functions 
are disabled.
–
Soft 
edge
Softens the edge of 
the key.
–
Zabton Inserts a translucent 
pattern to the key 
background. You can 
adjust the pattern size, 
softness, density, and 
color.
–
Type Description Video