Create transparency with a color‑based
keying effect
To create
transparency wherever a specific color occurs in a clip, apply a
color‑based keying effect. These effects are commonly used to remove a
colored background.
1.In the Effects view, expand the Video Effects folder and the
Keying category folder.
2.Drag a color‑based keying effect (Chroma, Blue Screen, Green
Screen, or Non Red) to a clip in the Timeline or Sceneline.
3.Click the Edit Effects button at the bottom of the Tasks panel to
open the Properties view.
4.In the Properties view, expand the effect name to view and edit
the effect’s options.
Replacing a
background color with another image
A.
Upper clip
B.
Blue Screen Key
effect defines transparent areas
C.
Lower clip
D.
Combined clips
Use the Chroma Key effect to select a color or
range of colors to be transparent. You can use
this key for a scene shot against a screen that
contains a range of one color, such as a shadowy
blue screen. Select a key color by clicking the
Color swatch or by clicking the Eyedropper tool
and selecting a color in the Monitor panel.
Apply the Chroma Key effect to a clip multiple
times to key out multiple colors.
Adjust the following Chroma key settings as
needed:
Similarity
Broadens or reduces the range of color that
will be made transparent. Higher values increase
the range.
Blend
Blends the clip you are keying out with the
underlying clip. Higher values blend more of the
clip.
Threshold
Controls the amount of shadows in the range
of color you keyed out. Higher values retain
more shadows.
Cutoff
Darkens or lightens shadows. Drag to the
right to darken shadows, but do not drag beyond
the Threshold slider; doing so inverts gray and
transparent pixels.
Smoothing
Specifies the amount of anti‑aliasing
applied to the boundary between transparent and
opaque regions. Anti‑aliasing blends pixels to
produce softer, smoother edges. Choose None to
produce sharp edges with no anti‑aliasing. This
option is useful when you want to preserve sharp
lines, such as those in titles. Choose Low or
High to produce different amounts of smoothing.
Mask Only
Displays only the clip’s alpha channel, as
modified by the key settings. If Mask Only is
selected, opaque areas of a clip appear white,
transparent areas appear black, and partially
transparent areas appear gray. Remove all the
gray areas to produce a clean, hard‑edged key.
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Apply the Chroma Key effect to a clip multiple
times to key out multiple colors.