Adobe 25520388 User Guide - Page 389

Image Matte Key effect, Define transparent areas with Image Matte Key

Page 389 highlights

USING ADOBE PREMIERE PRO 384 Effects and transitions 6 Do any of the following to adjust the mask shape: • With the Garbage Matte effect selected in the Effect Controls panel, drag the Garbage Matte handles in the Program Monitor. • Adjust the Garbage Matte point settings in the Effect Controls panel to specify the size and position of the garbage matte. 7 (Optional) If you're animating the Garbage Matte Key, move the current-time indicator either in the Effect Controls panel or a Timeline panel and then change the Garbage Matte handle positions in the Program Monitor or adjust the settings in the Effect Controls panel. A new keyframe appears in the Effect Controls timeline when you move the handles in the Program monitor or change the settings in the Effect Controls panel. You can also adjust the interpolation between keyframes by editing the keyframe graph. Repeat this step as needed. More Help topics "Modify keyframe values" on page 420 Image Matte Key effect The Image Matte Key effect keys out areas of a clip's image based on the luminance values of a still image clip, which serves as a matte. The transparent areas reveal the image produced by clips in lower tracks. You can specify any still image clip in the project to serve as the matte; it does not have to be in the sequence. To use a moving image as the matte, use the Track Matte Key effect instead. Define transparent areas with Image Matte Key The Image Matte Key determines transparent areas based on a matte image's alpha channel or brightness values. To get the most predictable results, choose a grayscale image for your image matte, unless you want to alter colors in the clip. Any color in the image matte removes the same level of color from the clip you are keying. For example, white areas in the clip that correspond to red areas in the image matte appear blue-green (since white in an RGB image is composed of 100% red, 100% blue, and 100% green); because red also becomes transparent in the clip, only blue and green colors remain at their original values. Note: You can use the Titler to create shapes and text to use as mattes. A still image used as a matte (left) defines transparent areas in the superimposed clip (center), revealing background clip (right). 1 Add the clip (used as a background) to a video track in a Timeline panel. 2 Add the clip you want to superimpose to any track higher than the track containing the background clip. This is the clip revealed by the track matte. Be sure the superimposed clip overlaps the background clip in a Timeline panel. 3 In the Effects panel, click the triangle to expand the Video Effects bin and then click the triangle to expand the Keying bin. 4 Drag the Image Matte Key to the superimposed clip in a Timeline panel. 5 In a Timeline panel, select the superimposed clip. Last updated 1/16/2012

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384
USING ADOBE PREMIERE PRO
Effects and transitions
Last updated 1/16/2012
6
Do any of the following to adjust the mask shape:
With the Garbage Matte effect selected in the Effect Controls panel, drag the Garbage Matte handles in the Program
Monitor.
Adjust the Garbage Matte point settings in the Effect Controls panel to specify the size and position of the garbage
matte.
7
(Optional) If you’re animating the Garbage Matte Key, move the current-time indicator either in the Effect
Controls panel or a Timeline panel and then change the Garbage Matte handle positions in the Program Monitor
or adjust the settings in the Effect Controls panel.
A new keyframe appears in the Effect Controls timeline when you move the handles in the Program monitor or change
the settings in the Effect Controls panel. You can also adjust the interpolation between keyframes by editing the
keyframe graph. Repeat this step as needed.
More Help topics
Modify keyframe values
” on page
420
Image Matte Key effect
The Image Matte Key effect keys out areas of a clip’s image based on the luminance values of a still image clip, which
serves as a matte. The transparent areas reveal the image produced by clips in lower tracks. You can specify any still
image clip in the project to serve as the matte; it does not have to be in the sequence. To use a moving image as the
matte, use the Track Matte Key effect instead.
Define transparent areas with Image Matte Key
The Image Matte Key determines transparent areas based on a matte image’s alpha channel or brightness values. To
get the most predictable results, choose a grayscale image for your image matte, unless you want to alter colors in the
clip. Any color in the image matte removes the same level of color from the clip you are keying. For example, white
areas in the clip that correspond to red areas in the image matte appear blue-green (since white in an RGB image is
composed of 100% red, 100% blue, and 100% green); because red also becomes transparent in the clip, only blue and
green colors remain at their original values.
Note:
You can use the Titler to create shapes and text to use as mattes.
A still image used as a matte (left) defines transparent areas in the superimposed clip (center), revealing background clip (right).
1
Add the clip (used as a background) to a video track in a Timeline panel.
2
Add the clip you want to superimpose to any track higher than the track containing the background clip. This is
the clip revealed by the track matte.
Be sure the superimposed clip overlaps the background clip in a Timeline panel.
3
In the Effects panel, click the triangle to expand the Video Effects bin and then click the triangle to expand the
Keying bin.
4
Drag the Image Matte Key to the superimposed clip in a Timeline panel.
5
In a Timeline panel, select the superimposed clip.