ADOBE AFTER EFFECTS 7.0
User Guide
277
See also
“Extract effect (Pro only)” on page 464
To use the Spill Suppressor effect
1 Select the layer and choose Effect > Keying > Spill Suppressor.
2 Choose the color you want to suppress in one of the following ways:
• If you have 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: TousetheeyedropperintheLayerpanel,chooseSpillSuppressorfromtheViewpop-upmenuintheLayerpanel.
3 In the Color Accuracy menu, choose Faster to suppress blue, green, or red. Choose Better to suppress other colors,
because After Effects may need to analyze the colors more carefully to produce accurate transparency. The Better
option may increase rendering time.
4 Drag the Suppression slider until the color is adequately suppressed.
See also
“Spill Suppressor effect (Pro only)” on page 466
To use the Inner/Outer Key effect
To use the Inner/Outer key, create a mask to define the inside and outside edge of the object you want to isolate. The
mask can be fairly rough—it does not need to fit exactly around the edges of the object.
In addition to masking a soft-edged object from its background, Inner/Outer Key modifies the colors around the
border to remove contaminating background colors. This color decontamination process determines the
background's contribution to the color in each border pixel, and removes that contribution—thus removing the halo
that can appear if a soft-edged object is matted against a new background.
1 Select the border of the object that you want to extract by doing one of the following:
• Draw a single closed mask near the object's border; then select the mask from the Foreground menu and leave the
Background menu set to None. Adjust the Single Mask Highlight Radius to control the size of the border around
this mask. (This method works well only on objects with simple edges.)
• Draw two closed masks: an inner mask just inside the object, and outer mask just outside the object. Make sure
that any fuzzy or uncertain areas of the object lie within these two masks. Select the inner mask from the
Foreground menu and the outer mask from the Background menu.
Note: Make sure that the mask mode for all masks is set to None.
2 If you want, move the masks around to find the location that provides the best results.
3 Toextractmorethanoneobject,ortocreateaholeinanobject,drawadditionalmasksandthenselectthemfrom
the Additional Foreground and Additional Background menus. For example, to key out a woman’s hair blowing in
the wind against a blue sky, draw the inner mask inside her head, draw the outer mask around the outside edge of
her hair, and then draw an additional mask around the gap in her hair where you can see sky. Select the additional
mask from the Additional Foreground menu to extract the gap and remove the background image.
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