Items you will need

• Adobe Premiere editing software (preferably Pro, Elements, CS3, CS4 versions)

• Computer with adequate RAM Memory for video editing (at least 1 GB)

Adobe Premiere allows you to remove the background with an effect called a Garbage Matte. In earlier versions of Premiere such as 6.5 and Pro, your options were a 4-point and 8-point Garbage Matte effect. Premiere CS3 and CS4 offer a 16-point Garbage Matte and much easier tools to create the matte. However, Premiere Pro will accomplish the background removal if you have a little patience.

Import your video to be fixed and the background video to the Premiere Project bin. Drag your background picture to Video layer 1 and your video to be fixed to Video layer 2. For this tutorial we are going to put this art sculpture produced by William H. Thielen into the golf course video.

Highlight Window on the top toolbar and then Effects. In the Effects bin look for Video Effects, Keying and then chose the 4-, 8- or 16-point Garbage Matte. To work with this effect you must open Effect Controls, again under Window in the top toolbar. In the Effect Controls bin, click the box to the left of the words 16-Point Garbage Matte and control wheels will appear over your subject video (see picture).

Move the Garbage Matte control wheels around the object in the Sequence Monitor. You will begin to see the background appear behind your subject.

When you have eliminated all the subject background, you may want to resize the object and place it somewhere else in the picture. Use Motion in the Effect Controls window for Position and Scale.

The last step is to render your layer by pressing the space bar, which will give you the best video quality. You can add another layer to the timeline and put more sculptures on the golf course using the garbage mattes.

Tips

If your subject needs more than a 16-point garbage matte, you can use two effects on a single layer. It's also best to pick a subject that doesn't move too much or need too much blending into the background.

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You can chroma key your video footage in Premiere Pro without sending your clips to After Effects. Keying in Premiere Pro is simple and effective.

Chroma keying is usually something that is done in After Effects, but sometimes, whether the simplicity of the project or just the fact that you do not want to send your footage to After Effects, you’ll want to chroma key in Premiere Pro.

This is Dan. He’s about to get chroma keyed.

Premiere Pro comes with a great keyer built right in called “ultra key.” Ultra Key was introduced to Premiere Pro in version CS5, so if you are using a version prior to CS5, you won’t be able to use this tool.

First, we’re going to apply a matte to our footage to get rid of the excess parts of the frame. I usually use “16-point garbage matte” to my footage and move the points loosely around my subject. If your subject is really simple, you can get away with only using the 8-point garbage matte.”

You’ll have to click the effect in your “effects controls” window to be able to move the points around.

Adjust the points around your subject.

Now that we have our frame trimmed in a little bit, we’ll apply the effect, “ultra key.”

Once we’ve applied the effect, in our effects controls window, select the eyedropper tool. This is how we select our green chroma color. Now, click the green screen with the eyedropper. Choose a point that is close to the subject’s face. If your greenscreen was not lit well you may have to choose either a lighter or a darker shade of green in your clip. If this is the case, choose the darker shade. This will make it easier to get a perfect key.

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Click the eyedropper to choose your chroma color.

Select a shade of green with the eyedropper tool.

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Now, change the output view to “alpha.” This will help us see the detail when we’re adjusting parameters.

Select “alpha channel.”

This is a view of your alpha channel.

If your lighting of the green screen was really even when you shot it, you won’t have to adjust much of the parameters. You can sometimes get away with just changing the setting to “aggressive.” But, if your green screen was lit less-than-perfect, you will need to adjust some of the parameters.

Premiere Keying: Transparency & Pedestal

There are a few main adjustments that we’ll take a look at. First, if your subject (in white) has some black scattered throughout, adjust the “transparency” slider under “matte generation.” That will clean up your subject to make sure that the hair and small details are included.

Next, to clean up the background (in black) adjust the “pedestal” slider. This will clean up the background and make it completely black in this alpha view. If you have some trouble with the background in the shadows, adjust the “shadow” parameter.

That’s looking pretty good, but we’re not quite done yet. Set your output view back to “composite” so we can see what our video is looking like. Go ahead and put a backdrop behind your subject to give you a better visual reference.

Premiere Keying: Choke & Soften

In most cases, we’ll need to choke and soften the key a bit. Choking the key is the act of “shrinking” in the key. Softening the key is the act of feathering the key out at the edges. Both of these help to create the illusion that your subject is seamlessly in the scene with your background.

Under “matte cleanup,” adjust the “choke” slider up slightly. A little bit goes a long way with choke and soften. Don’t go up too much or it will look weird. I try to never go above 25 with choke.

Adjusting the choke will “shrink” your key.

Next, adjust the “soften” slider until the blending of your subject’s edges look good. Not too much! With “soften” I try to never go above 20.

Adjusting the soften slider will feather the edge of your key.

Adjust both “choke” and “soften” until you have a perfect edge blend.

If you have some green spilling through your subject’s hair, play with the “spill suppression” settings. I sometimes have to bring “luma” and “spill” up a bit when keying difficult clips.

There you go. You’ve just chroma keyed in Premiere Pro!

For bonus points, you can add a drop shadow to your subject to make it seem more natural. NOTE: only add a drop shadow if it makes sense to use with your composited backdrop.

Adding a drop shadow is subtle, but effective.

Chroma keying directly in Premiere Pro will save you time, avoiding having to dynamically link to After Effects. It will also save you render time, which is always good. Depending on your editing system, you might be able to playback the keyed footage in real-time without rendering.

Got Premiere Pro keying questions?
Share your questions and thoughts in the comments below!