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Up and Running with Premiere Elements 11
Illustration by John Hersey

Using the Chroma Key and Videomerge effects


From:

Up and Running with Premiere Elements 11

with Steve Grisetti

Video: Using the Chroma Key and Videomerge effects

You no doubt encounter chroma key effects on a regular basis whether you're aware of it or not. Keying removes the background from behind an actor, for instance, and it replaces it with any real or imagined background. And you see this process used in everything from big-budget fantasy and science fiction movies to nightly TV weather reports. Now, you can do it on your home computer too. You need two things to create the effect and I do recommend you work in Expert view; it's a little hard to make this effect successful if you're working in Quick view. You need two things.
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  1. 8m 30s
    1. Welcome
      57s
    2. Understanding the basics of editing
      2m 45s
    3. Getting to know the interface
      3m 47s
    4. Using the exercise files
      1m 1s
  2. 22m 46s
    1. Capturing video from a tape-based camcorder
      4m 8s
    2. Downloading video from a hard drive or a storage-based camcorder
      4m 26s
    3. Importing media already on your computer
      2m 22s
    4. Managing media files with the Organizer
      6m 7s
    5. Organizing media in the Project Assets panel
      5m 43s
  3. 19m 45s
    1. Editing with Quick view vs. editing with Expert view
      5m 42s
    2. Adding, slicing, and trimming clips, and performing ripple edits
      7m 53s
    3. Pretrimming media in the clip monitor
      6m 10s
  4. 23m 2s
    1. Looking at the Action Bar toolkit
      4m 26s
    2. Recording narration
      3m 19s
    3. Creating a motion path with the Pan & Zoom tool
      9m 10s
    4. Speeding up or slowing down video segments with Time Remapping
      6m 7s
  5. 19m 3s
    1. Adjusting color, lighting, and audio
      5m 45s
    2. Adding and customizing a video effect
      7m 25s
    3. Using the Chroma Key and Videomerge effects
      5m 53s
  6. 14m 19s
    1. Adding and customizing an audio effect
      6m 14s
    2. Creating custom music tracks with Quicktracks
      8m 5s
  7. 12m 55s
    1. Creating fade-ins and fade-outs
      5m 36s
    2. Adding and customizing a transition
      7m 19s
  8. 9m 22s
    1. Adding and customizing a title
      4m 58s
    2. Adding a text animation
      4m 24s
  9. 18m 34s
    1. Creating a custom motion path using keyframes
      4m 35s
    2. Keyframing video effects
      6m 43s
    3. Mixing several tracks of audio using keyframes
      7m 16s
  10. 14m 10s
    1. Adding menu markers
      5m 21s
    2. Applying a menu template
      5m 33s
    3. Adding a "special features" video to your DVD or Blu-ray
      3m 16s
  11. 10m 34s
    1. Burning a DVD or a Blu-ray disc
      3m 46s
    2. Uploading video to Facebook or YouTube
      4m 6s
    3. Outputting a movie for viewing on a portable device
      2m 42s
  12. 1m 13s
    1. Next steps
      1m 13s

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Up and Running with Premiere Elements 11
2h 54m Beginner Nov 28, 2012

Viewers: in countries Watching now:

Whether you're new to the program altogether or a pro who needs a refresher on the latest features, author Steve Grisetti gets you up and running quickly with Premiere Elements 11, the affordable and intuitive video-editing program from Adobe.

The course walks through the entire editing workflow, from importing and organizing your raw assets, to timeline editing in Quick view and Expert view, to sharing your work on DVD, Blu-ray, or on the web. Along the way, you'll discover how to enhance your basic videos with voiceover, slow motion, transitions, titles, and a solid soundtrack. In less than three hours, this course will show you what you need to know to create polished gems from almost any kind of raw footage, from tape-based DV, to AVCHD, to smartphone and iPad video footage.

Topics include:
  • Capturing video from a camcorder
  • Importing media on your computer
  • Managing media with the Organizer
  • Adding clips, slice, trim, and ripple edits
  • Creating a motion path with the Pan & Zoom tool
  • Speeding up or slowing down video segments with Time Remapping
  • Color-correcting video
  • Building custom music tracks with Quicktracks
  • Creating fade-ins and fade-outs
  • Adding text animation
  • Keyframing video effects
  • Burning a DVD or Blu-ray disc
  • Uploading your video to Facebook or YouTube
Subjects:
Video Video Editing
Software:
Premiere Elements Elements
Author:
Steve Grisetti

Using the Chroma Key and Videomerge effects

You no doubt encounter chroma key effects on a regular basis whether you're aware of it or not. Keying removes the background from behind an actor, for instance, and it replaces it with any real or imagined background. And you see this process used in everything from big-budget fantasy and science fiction movies to nightly TV weather reports. Now, you can do it on your home computer too. You need two things to create the effect and I do recommend you work in Expert view; it's a little hard to make this effect successful if you're working in Quick view. You need two things.

You need a new background and you need a key clip, and our key clip is going to be our actor shot in front of, in this case, a green screen. So let's add our background to Video track 1. In this case, I'm using a photo, and you can use a video also. If you add a photo to your timeline and your video frame is 16 x 9 and your 4 x 3 photo does not fill out the frame, it may be because Scale to Frame Size is checked. Right-click on the clip and uncheck Scale to Frame Size.

Now it'll fill out the frame. Let's get our key clip and we'll enter key clip to Video track 2, directly above our new background. Whenever you add a clip that has a smooth background to it--in this case a green screen background--the program automatically assumes you want to create a Videomerge effect. Now we do; we just don't want to do it right now. I find this little pop-up annoying because sometimes it pops up when you just have like a picture of the sky, something that is a smooth-color background.

It assumes it's a green screen or a blue screen. If you want to see this message go away and never come back, click on that box and then select No. The success of your green screen, it's only going to be as good as the clip you have for your key clip. In this case, we have a really nice one. See how smooth the background is? It's a nice even color of green. It's evenly lit. There are no wrinkles. There are no shadows. There are no hotspots. That's going to make a very nice key clip. And what we're going to do when we apply Chroma Key or Videomerge is we're going to remove everything that's green from this picture and make it transparent, and that what we'll reveal the video or the still photo we have on Video track 1.

Now, our still photo doesn't go the entire length of the clip. Since it's a still photo, we can just hover over the end here until we get our trim indicator and drag it out so that it's the same length as our ChromaKey clip. Now we are ready to go. The Chroma Key effect is located on the Effects panel. We can open that by clicking on the Effects button on the Action bar. And let's go to the Keying effects category. Chroma Key comes in a couple of different flavors: Blue Screen Key, Green Screen Key. Chroma Key is sort of the generic. In this case we have yet a green screen, so let's apply the Green Screen Key. Just drag it right onto your key clip on your timeline.

That's the one on Video 2. And there, at its default setting, it does a pretty good job. Let's go to Applied Effects by clicking on the Applied Effects button on the right-hand side. We'll open up the Green Screen settings, clicking on that, and when you make adjustments to your green screen or your blue screen or your chroma key, I recommend that you select the option to see Mask Only. That will show you what is and what is not being removed and as you can see, we have just a little bit too much being removed right now. So let's adjust the cutoff a bit.

That looks pretty good. Threshold will kind of smooth it out. Let's uncheck the Mask Only and when we go back to the clip, it looks pretty darn good. We'll reset the playhead to the beginning by dragging it to the beginning of the timeline, and then I'm going to press the spacebar to play it. That doesn't look too bad. It'll look even better when we render it out. There is one challenge here, and that is if you have the Macintosh version of the program, unfortunately you have neither Blue Screen, Green Screen or the Chroma Key effect.

I don't know why they left that out. Fortunately, you do have Videomerge, and that's available in both the PC and Mac version, and it does this kind of keying effect extremely effectively. So let's go back to our clip, and I'm just going to remove the Green Screen Key effect by clicking on the trashcan, and this time we'll apply Videomerge. Now, Videomerge is available in a couple of different places. You saw that it will automatically apply if you let it. If we go to the Effects panel and go to the Videomerge category, it's right there. Or we can just right-click on the clip and select Apply Videomerge.

At its default setting, not too bad. We do have a little bit of dithering up here in the sky, so let's adjust it a bit. We'll open up Videomerge in the Applied Effects panel. And what I recommend you do, even though Videomerge does a pretty good job of guessing what the key color is, we're going to designate it, and you can do that by checking the box where it says Select Color, then clicking on the eyedropper--that's a sampler--and let's designate the background at a good sort of midrange of that green, right about here. Now it does a great job of taking it away.

If we want to adjust it a bit, we can adjust the Tolerance; the wider the Tolerance, the more color it's going to remove. We don't want to remove too much, because we don't want to remove any of our actor. But we're in pretty good shape, and this time let's render it out. I am going to click the Render button here. You can also render your timeline by pressing the Enter key or the Return key on your Macintosh. I'll set the playhead back to the beginning of the timeline, and I'll press the spacebar to play it.

Chroma Key and Videomerge fall into a category I like to call Magic Effects. They make something that isn't real appear to be real and ideally they do it without the audience even being aware of the effect. For my money, keying effects are some of the most fun effects in the program to play with.

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