Apple Motion 5.1.1 - Manual (Page 500)

Chapter 13 Keying 500
You can also set the View mode to Matte, which helps you see the effect of using the Edges tool.
(The Matte mode also helps you review your work when you modify the Fill Holes and Edge
Distance parameters.)
Tip: If you open the Color Selection controls while dragging the center handle, you can see how
the Edges control alters the outer softness graph of the Chroma control and the bottom softness
handles of the Luma controls.
Add Sample Color and Edges controls in the Canvas using keyboard shortcuts
1 In the Layers list, select the Keyer filter to adjust.
2 Do one of the following:
•
To create a Sample Color selection box, hold down the Shift key while dragging over the color
you want to key in the Canvas.
•
To create an Edges sampling control, hold down the Command key while dragging to draw a
line that crosses over the edge of the subject you’re keying in the Canvas.
•
To remove a Sample Color or an Edges control, Option-click anywhere in the control you want
to delete, or click to select a sample control, then press the Delete key.
Refine a key using the Color Selection controls
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 your adjustments affect the transparency of the image. The keyed
image now 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).
2 Click the disclosure triangle in the Color Selection row of the Filters Inspector to reveal
additional controls.
3 Choose one of the two Graph modes to select a mode for the adjustments you need:
•
Scrub Boxes: Remain in Scrub Boxes mode (the default) if you are satisfied with the current key
but want to adjust the edge softness of the resulting matte. In Scrub Boxes mode, you can
adjust the outer graph of the Chroma control and the lower handles of the Luma control to
increase or decrease the translucency of the edges of the matte.
•
Manual: Click Manual to make substantial alterations to tolerance (core transparency) and
edge softness in matte. In Manual mode, you can adjust the inner and outer graphs of the
Chroma control, as well as the upper and lower handles of the Luma control to alter all aspects
of transparency in the matte. In Manual mode, you cannot alter the Strength parameter or add
more Sample Color or Edges controls in the Canvas.
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