ADOBE PREMIERE PRO 2.0
User Guide
360
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Select the Eyedropper icon and click anywhere on your computer’s desktop to select a color.
The selected color for the Chroma Key or Difference Key appears in the swatch next to the Eyedropper icon.
5
Adjust the key’s settings. If you’re not animating the keying effect over time, you can skip steps 6 and 7.
Note:
For information about key settings, see the topic for the specific key.
6
(Optional) If you’re animating the keying effect over time, make sure the current-time indicator is at the position
you want and then click the Toggle Animation icon
for the setting you’re changing over time. A keyframe appears
in the Effect Controls timeline.
7
(Optional) Move the current-time indicator again and do any of the following to make an adjustment:
•
Enter a value for the setting.
•
Click the triangle next to the setting name to expand its settings and drag the slider to specify a value. You can also
drag a point in the graph in the Effect Controls panel.
A new keyframe appears in the Effect Controls panel when you adjust the setting. You can also adjust the interpo-
lation between keyframes by editing the keyframe graph in the Effect Controls panel. Repeat step 7 as needed.
To more effectively evaluate the settings of a key effect, view the clip’s composite view and the clip’s alpha channel
simultaneously. Choose New View from the Program Monitor menu, and then choose Alpha from the new Program
Monitor menu.
See also
“About keying” on page 355
“About mattes” on page 364
“To key out a single color” on page 361
“To edit keyframe graphs in the Effect Controls panel” on page 238
Using the Chroma Key
The Chroma Key effect specifies which color or range of colors in the clip becomes transparent. You can use this key
for a scene shot against a monochromatic screen, such as a blue or green screen.
The following Chroma Key settings are adjusted in the Effect Controls panel:
Similarity
Broadens or reduces the range of the target 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 that Adobe Premiere Pro applies to the boundary between trans-
parent 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. Black represents transparent areas, white represents opaque areas,
and gray represents partially transparent areas.