Apple Motion 5.1.1 - Manual (Page 502)

Chapter 13 Keying 502
In either mode, expanding the Chroma graph or Luma handle outward increases the regions of
transparency in the keyed image. Dragging the side of a Chroma graph or a Luma handle inward
diminishes the transparent regions in the keyed image. In the example below, the top image
shows the holes in the matte that result from increasing edge softness using the outer graph of
the Chroma control. The bottom image shows how reducing edge softness closes these holes.
Narrowing softness
Widening softness
5 If you haven’t adjusted the Luma control, drag the left or right lower handles to alter the softness
of the luma component of the image.
Tip: In Manual mode, you can adjust the lower handles by dragging the bar connecting the top
and bottom handles. To adjust all handles simultaneously, drag inside the curve in the graph.
6 Adjust the Chroma and Luma Rolloff sliders to subtly alter the falloff between the tolerance and
softness of the key.
Refine a key using Matte Tools
1 With the Keyer filter selected in the Layers list, set the View mode in the Filters Inspector to
Matte.
Matte mode lets you see how adjustments affect the transparency of the image. The keyed
image appears in grayscale: white areas represent solid pixels in the final matte; black areas
represent transparent pixels in the final matte; and varying levels of gray represent translucent
pixels in the final matte (darker gray is more transparent; lighter gray is more opaque).
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