Apple Motion 5.1.1 - Manual (Page 499)

Chapter 13 Keying 499
3 In the Filters Inspector (or HUD), click to select the Sample Color tool.
4 In the Canvas, drag a selection box over an area of the green screen color that you are
attempting to key.
Most of the green screen should disappear and be replaced by the image in the layer
underneath the foreground layer in the Layers list. You can add as many selection boxes as
necessary to sample areas of the green background (for example, highlights or shadows on the
green screen) to achieve a better result.
If the edges of the foreground subject are too sharp, use the Edges tool to soften the foreground
edges. The Edges tool is also effective for fine-tuning semitransparent features such as smoke,
glass reflections, and shadows.
5 In the Filters Inspector or HUD, click to select the Edges tool.
6 In the Canvas, drag a line over the edge of the foreground subject so one end point lies in the
interior of the foreground subject and the other end point lies in the background (the orange sky).
An Edges control line appears in the Canvas.
7 In the Canvas, drag the center handle of the Edges control line to adjust the edge transparency
of the keyed subject.
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