Using Help | Contents | Index Back - Adobe AFTER EFFECTS 5.5 Help Manual

Adobe After Effects Help
Using Help | Contents
The Color Difference Key produces high-quality keying for all well-lit footage items shot
against a bluescreen or greenscreen and works especially well with images that contain
transparent or semitransparent areas, such as smoke, shadows, or glass.
A
B
C
A. Original image thumbnail B. White eyedropper C. Matte controls D. Thumbnail eyedropper E.
Black eyedropper F. Matte thumbnail G. Matte buttons H. View I. Key Color swatch and
eyedropper J. Color Matching Accuracy
To apply the Color Difference Key:
1 Select the layer you want to make transparent, and then choose Effect > Keying > Color
Difference Key.
2 In the Effect Controls window, choose Matte Corrected from the View menu. To view
and compare the source image, both partial mattes, and the final matte at the same time,
choose [A, B, Matte] Corrected, Final from the View menu. Other views available in the
View menu are described in step 10.
3 Select the appropriate key color in one of the following ways:
To key out a bluescreen, use the default blue color.
•
To key out a non-bluescreen, select a key color in one of the following ways:
•
Thumbnail eyedropper Select and then click in the Composition window or the original
image thumbnail on an appropriate area.
Key Color eyedropper Select and then click in the Composition or Layer window on an
appropriate area.
Key Color swatch Click to select a color from the specified color space.
Note: The eyedropper tools move the sliders accordingly. Use the sliders in step 9 to fine-
tune the keying results.
4 Click the matte button to display the final combined matte in the matte thumbnail.
Using Help | Contents
| Index
D
E
F
G
H
I
J
| Index
Applying Effects
Back 200
Back 200