Applying a Match Move

The Match Move option composites a foreground image over the input image by pinning source points on the foreground to the track points on the input. Typically, a match move uses all four trackers to place one image into a specific region of another, as shown in the images below.


First, the trackers are positioned in the input image and the motion paths are generated.	Next, the source points are positioned on the foreground image. Each source point corresponds to a track point.	When Match Move mode is activated, the foreground image is pinned to the input image at each track point/source point pair.

To apply a match move

Insert a Tracking Operator into the FxTree.

Make sure to connect the desired foreground image to the operator's foreground input.
Set up the trackers as described in Setting Up the Trackers. The track points should be positioned at the locations where you want to pin the foreground image's corners.
Create the motion paths, as described in Creating Motion Paths.
From the Tracking property editor, click the Trackers button to display the Trackers page.
On the Mode tab, set the Track Mode to Match Move.
Now click the Transform button to display the Transform page.

The source-point markers are displayed in the Fx Viewer.

NoteThe source points are only visible in the Fx Viewer when you are editing the Tracking operator, and its property editor is set to the Transform page.
While editing the Tracking operator, click the foreground image operator's View hotspot to preview the image in the Fx Viewer.
Click and drag the source points markers to the areas that you wish to pin to the corresponding tracking markers.

The source points are numbered according to their corresponding trackers, so source point 1 in the foreground image corresponds to track point 1 in the input image.

TipYou can also position the source points from the Tracking property editor by adjusting the values on the Source Point tab of the Transform page. The tab contains controls for moving each track's source point in X and Y.
In the FxTree, click the Tracking operator's View hotspot to preview it in the Fx Viewer. You should now see the result of the match move.
Play back the sequence to process the match move.
You can now do any of the following:
- Fine-tune the match-move by adjusting the positions of the trackers and/or the source points.
- Set the Transform options on the Transform tab of the Transform page to scale, rotate, and translate the foreground image. See the following section, Transforming the Foreground Image, for details.
- Perform a perspective transform on the foreground image using the controls on the Corner tab of the Transform page. See Perspective-Transforming the Foreground Image for details.
- Set the options on the Rendering tab of the Transform page to control how the match move result is output. See Setting the Rendering Options for a Match Move for details.

Transforming the Foreground Image

You can transform the foreground image in a match move using the controls on the Transform tab of the Transform page. See Tracking [Fx Operator Reference].

Perspective-Transforming the Foreground Image

You can perform a perspective transformation on the foreground image of a match move using the controls on the Corner tab of the Transform page. The X and Y sliders for each corner control the foreground image's coordinates for the perspective transform. See Tracking [Fx Operator Reference].

Setting the Rendering Options for a Match Move

The Rendering tab of the Transform page is where you can set various options that control what the Tracking operator outputs when you apply a match move or a one-point stabilization. You can set the following options:

Option	Function
Opacity	Controls the opacity of the foreground.
Foreground Type	Renders the output image as non-premultiplied, premultiplied, or to suppress a backing color.
Backing Color	Suppress the selected backing color when On Backing Color is selected from the Foreground Type list.
Output Alpha	Choose to output the input image's alpha, the foreground image's alpha, or a combination of both.
Resampling	Specifies the method by which the pixel content of the transformed image is calculated. Point is the simplest and fastest method; Bilinear is slower, but better for scaling up; EWA (Elliptic Weighted Average) is slower, but best if scaling down by a large degree; Lanczos is the slowest, but best if previewing the sharpness of the image.
Wrap Transform	When you are doing a one-point stabilization, it is likely that you will lose some of the image. Wrap Transform can help prevent this from happening. When Wrap transform is activated, the edges of the image that would otherwise be lost during stabilization wrap themselves around that gaps in the image that are created during the stabilization. The net result is that the image area does not change.
Make Cutout	Outputs the transformed foreground only. During a Match Move, select Make Cutout to output the transformed foreground only. You can then composite this foreground onto a background.

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