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So a lot of motion graphic artists use Image Masks, and basically all that is taking the alpha channel of one object to cut a hole in the other object. Just let me show you. Open up your Project pane and hit F5 and let's see what we have got. We have a breakdancer, and Vegas text, and Vegas footage and a gradient. Let's get started by using the Vegas Text alpha channel to cut a hole in the Vegas Footage. So select your Text, open up your HUD and resize your text.
Bring it up to about 200. And reposition in the middle here. And let's have it scroll from one side to the other. Hit Cmd+Minus to shrink your canvas and drag your text over to the right. Hold down Shift as you drag to lock it to the X axis. And let's apply Behavior, Basic Motion Throw. And we want to just throw it towards the left, so just click and drag towards the left and if you hold down Shift it will keep it on its axis, and go and hit spacebar, I want to see how fast that's moving.
I'd like to move just a little faster so I am going to up my zoom here, and drag this further out, so it pushes it just a little bit harder and therefore makes it go faster. So now let's go ahead and use the alpha channel from this text to cut a hole in the Vegas footage. Select your Footage, go up under object and choose add Image Mask. Now the Image Mask is sitting here waiting for us to drop the text in, so go ahead and drag the text and drop it right into the image mask, and let go.
And there, we have just used the alpha channel of the Vegas Text to cut a hole in the footage. Go ahead and stop play back for a second. Move your playhead back to the beginning. Turn off your text layer. If you ever want to get rid of an image mask, go ahead and open your HUD and right here in the Mask Source just click and drag off to the side really quickly. And you'll notice it disappear. We still have the Image Mask applied to the footage, so we can add another source, so let's go ahead and use the breakdancer for this Image Mask.
Go ahead and drag and drop him right into the Image Mask and let go. And let's do Shift+Z, so we can see what it looks like and hit your spacebar. So we have our text and we have our dancer. Let's go ahead and adjust the text here, bring the opacity down. There we go, click in the canvas, hit your spacebar and there you have it, adding Image Masks.
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