Example: Using Motion Parameters and Wireframe Handles

In this example, you’ll put a graphic on the side of a building as if it were a sign. You’ll use the Scale, Center, and Distort parameters (in the Motion tab of the Viewer) to match the perspective of the building with the perspective of the sign, and the Selection and Distort tools to manipulate the graphic directly in the Canvas. This example assumes you’ve already created a new sequence and opened it in the Timeline.

Note: This example uses a sequence created for DV clips, with a frame size of 720 x 480.

To use the Scale, Center, and Distort parameters to match perspective
  1. Edit a shot of a building into track V1 of your sequence.

    Figure. Canvas window showing a shot of a building from a three-quarter angle.
  2. Import a graphics file (such as a PICT file) of a sign into your project, then open it in the Viewer.

    Figure. Canvas window showing a graphic of a sign to be superimposed on the building.
  3. In the Canvas or Timeline, position the playhead over the clip you just edited into track V1, then set the sequence In and Out points to be the duration of the building clip (choose Mark > Mark Clip, or press X).

    Figure. Timeline window showing sequence In and Out points set to match the duration of the building clip.
  4. Perform a superimpose edit to place the sign in track V2 for the duration of the shot.

    Figure. Canvas window showing the sign clip appearing in front of the building clip.

    Instead of changing settings in the Motion tab, you’ll manipulate the images in the Canvas.

  5. In the Timeline, select the image, then choose Image+Wireframe from the View pop-up menu in the Canvas.

    Figure. Canvas window showing the selected clip outlined in turquoise.
  6. With the Selection tool selected, hold down the Shift key, then drag one of the corners of the sign graphic to change its scale to match that of the building.

    Figure. Canvas window showing the sign clip resized smaller.
  7. With the Selection tool, drag the center point of the sign graphic to move it so that its position matches that of the wall.

    Figure. Canvas window showing the sign clip repositioned to appear over the side wall of the building.
  8. Select the Distort tool in the Tool palette, then drag each of the four corners of the sign graphic until they match the perspective of the side of the building.

    Figure. Canvas window showing the sign clip distorted to match the building's perspective.

    Tip: To make the sign look more convincing, you can also add a subtle drop shadow by enabling the Drop Shadow attribute in the Motion tab of the sign clip.