Adobe AFTER EFFECTS CS3 PROFESSIONAL User Manual page 453

Drag the Tolerance slider to specify the range of values to be keyed out. Lower values key out a smaller range of
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values near the threshold. Higher values key out a wider range of values.
Drag the Edge Thin slider to adjust the width of the keyed area's border. Positive values make the mask grow,
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increasing the transparent area. Negative values shrink the mask.
6 Drag the Edge Feather slider to specify the softness of the edge. Higher values create a softer edge but take longer
to render.
Spill Suppressor effect
The Spill Suppressor effect removes traces of the key color from an image with a screen that's already been keyed out.
Typically, the Spill Suppressor is used to remove key color spills from the edges of an image. Spills are caused by light
reflecting off the screen and onto the subject.
If you're not satisfied with the results from using the Spill Suppressor, try applying the Hue/Saturation effect to a layer
after keying, and then decrease the saturation value to de-emphasize the key color. (See "Hue/Saturation effect" on
page 396.)
This effect works with 8-bpc and 16-bpc color.
Original greenscreen (top left) leaves green glow when keyed out (bottom left). Spill Suppressor removes glow (bottom right).
See also
"Keying overview" on page 268
"Matte Choker effect" on page 448
"Simple Choker effect" on page 448
Use the Spill Suppressor effect
Select the layer and choose Effect > Keying > Spill Suppressor.
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Choose the color you want to suppress in one of the following ways:
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• If you already keyed out the color with a key in the Effect Controls panel, click the Color To Suppress eyedropper,
and then click the screen color in the key's Key Color swatch.
• In Spill Suppressor, click the Key Color swatch and choose a color from the color wheel.
Note: To use the eyedropper in the Layer panel, choose Spill Suppressor from the View menu in the Layer panel.
AFTER EFFECTS CS3 447
User Guide