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Chapter 4, Setting Up Realtime Effects withAdobe Premiere Pro
Creating a 4-corner pin effect
The Matrox 4-corner pin effect lets you anchor each corner of a video or graphics
clip onto points in an underlying clip, even if the underlying clip is angled or
skewed. You could use this effect, for exampl e, to overlay a video clip onto an
underlying clip of a television screen.
°To set up a Matrox 4-corner pin effect:
Click the triangle next to Matrox 4-corner Pin to expand the property list.
•Top Lef t and Top Right Corner Use these controls to horizontally and
vertically position the top left and right corners of your clip.
•Bottom Left and Bottom Right Corner Use these controls to
horizontally and vertically position the bottom left and right corners of your
clip.
¥Tip You can easily position each corner of your clip directly in the
Program Monitor. To do this, click the Transform icon ( ) beside
Matrox 4-corner Pin in the Effect Controls panel. A cursor will appear at
each corner of your clip in the Program Monitor. Drag these cursors to
position the corners of your clip.
•Edge Softness Lets you apply softness to the edges of your clip. If your
clip is skewed, you may get more desirable results using the Skewed Edge
Softness control.
•Skewed Edge Softness If you altered your clip so that the perspective is
skewed, you should use this option to apply softness to the edges of your
clip.
¡ Important Skewed Edge Sof tness is not supported on clips where any
corner is positioned beyond the boundaries of another corner. In order for the
Skewed Edge Softness to work correctly, your clip should be a flat plane
with four visible corners.
•Crop Allows you to crop the edges of your clip. For more information, see
“Cropping your clip” on page55.