Apple Motion 5.1.1 - Manual (Page 491)

Chapter 13 Keying 491
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Fill Holes: Use this slider adjust solidity in regions of marginal transparency throughout a key.
This parameter is useful when you’re satisfied with the edges of your keyed matte, but you
have unwanted holes in the interior of the foreground subject that you can’t eliminate using
the Strength parameter without ruining your edges. Higher slider values fill more holes in the
solid areas of the keyed subject.
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Edge Distance: Use this slider to adjust how close to the edge of your keyed subject the effect
of the Fill Holes parameter gets. Decreasing this parameter brings the solid, nontransparent
area of the matte closer to the edge of the subject being keyed, sacrificing translucence at the
edges in favor of filling unwanted holes at the edge of the keyed subject, or retrieving areas
of semitransparent detail, such as hair, smoke, or reflections. Increasing this parameter pushes
the filled area of the matte further to the interior of the subject, away from the edges, adding
translucence to regions of the image that aren’t being keyed aggressively enough. Increasing
this parameter too much may introduce regions of unwanted translucence in parts of the
subject that should be solid.
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Spill Level: Use this slider to set how much spill suppression is applied to the keyed subject.
Spill suppression is a color correction that neutralizes the green or blue colored light that
often bounces off a green screen or blue screen background and tints the edges of a subject
during a shoot. Consequently, it becomes more difficult to separate the foreground subject
from the background during the keying process. Spill suppression is applied when you add
the Keyer filter.
Without spill suppression With spill suppression
The color that is suppressed in the final image is based on the sampled portion of the image.
The Spill Level slider controls how much spill suppression is applied to the keyed subject.
For example, if the subject was shot in front of a green screen background, increasing the
Spill Level value adds magenta to the foreground image, which neutralizes any unwanted
green cast that your subject may be exhibiting. Spill suppression can be further customized
using the controls in the Spill Suppression group, described later. Setting Spill to 0 turns off
spill suppression.
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Invert: Select this checkbox to Invert the generated matte, so solid areas become transparent,
and vice versa.
Color Selection controls
Click the disclosure triangle in the Color Selection row to reveal controls for adjusting the
tolerance (core transparency) and softness (edge transparency) in the chroma and luma channels
of the keyed region. Which controls are adjustable depends on the Graph mode (Scrub Boxes or
Manual) you select in this group of controls.
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