This time, drag and drop the Luminance Mask effect preset onto the text image. ✓ Create the text mask as in our Multiply (Mask) example above. But if we want to take that text filled in with the image and then place that text over another image, then we have to make a compositing child track. In our Multiply (Mask) example above, we were able to make the image below show through the text. Parent/Child Tracks also make a difference when using compositing modes. Reduce or enlarge the size of the box, and all of the contents reduce or enlarge as one.
✓ Move the box around, and the contents of the parent track plus the contents of the child tracks all move together. Click it, and the Parent Track Motion window appears, but this time, the box is a square and not the shape of the video. A new Parent Motion button appears to the far left of the parent track header.
✓ On each track below, click Make Compositing Child, or choose it from the hamburger menu if the button isn’t visible.
