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604Final Cut Pro User Guide
1. In the Final Cut Pro timeline, select the clip with the Luma Keyer effect.
2. Open the Video inspector.
The Effects section of the Video inspector shows the parameters available for adjusting
the Luma Keyer effect.
3. Click Matte Tools to reveal the following controls:
• Fill Holes: Increasing this parameter value adds solidity to regions of marginal
transparency within a key. This control is useful when you’re satisfied with the edges
of your key, but you have unwanted holes in the interior that you can’t eliminate
using the Luma Rolloff parameter without ruining your edges.
• Edge Distance: Lets you adjust how close to the edge of your keyed subject the
effect of the Fill Holes parameter gets. Reducing this parameter value brings the
filled area of the matte closer to the edge of the subject, sacrificing translucency at
the edges. Raising this parameter value pushes the filled area of the matte farther
from the edge, potentially introducing regions of unwanted translucency within parts
of the subject that should be solid.
• Levels: Use this grayscale gradient to alter the contrast of the keyed matte, by
dragging three handles that set the black point, white point, and bias (distribution
of gray values between the black point and white point). Adjusting the contrast of a
matte can be useful for manipulating translucent areas of the key to make them more
solid (by lowering the white point) or more translucent (by raising the black point).
Dragging the Bias handle right erodes translucent regions of the key, and dragging
the Bias handle left makes translucent regions of the key more solid.