ADOBE PREMIERE PRO 2.0
User Guide
318
Chroma Key effect
A.
Original image
B.
Blue color keyed out
C.
Image on second track
D.
Final composite image
See also
“Using the Chroma Key” on page 360
Color Key effect
The Color Key effect keys out all image pixels that are similar to a specified key color. This effect modifies only the
alpha channel of a clip.
Color Key effect: A non-standard blue screen (left) and the background (center) are combined with Color Key (right).
When you key out a color value in a clip, that color or range of colors becomes transparent for the entire clip. Control
the range of transparent colors by adjusting the tolerance level. You can also feather the edges of the transparent area
to create a smooth transition between the transparent and opaque areas.
See also
“About the Color Key” on page 361
Difference Matte Key effect
The Difference Matte Key effect creates transparency by comparing a source clip with a difference clip, and then
keying out pixels in the source image that match both the position and color in the difference image. Typically, it is
used to key out a static background behind a moving object, which is then placed on a different background. Often
the difference clip is simply a frame of background footage (before the moving object has entered the scene). For this
reason, the Difference Matte Key is best used for scenes that have been shot with a stationary camera.
Difference Matte Key effect
A.
Original image
B.
Background image
C.
Image on second track
D.
Final composite image
A
B
C
D
A
B
C
D