How to Chroma Key in Windows Movie Maker

Record your subject.

• With any method of Chroma Key, you will need a video to superimpose over your background.
• Your subject must be shot in front of a dark blue or green background.

1. 2
   Method 1:
   • Highlight the following xml code: (Source-windowsmoviemakers.net/forums) 
     
     <!-- windowsmoviemakers.net/forums -->
     <TransitionsAndEffects Version="1.0">
     <Transitions>
     <TransitionDLL guid="{C5B19592-145E-11D3-9F04-006008039E37}" >
     <Transition name="Greenscreen" iconid="12" comment="Makes first clip show through blue areas of second clip">
     <Param name="KeyType" value="1"/>
     <Param name="Similarity" value="100"/>
     <Param name="Progress" value="0.0"/>
     </Transition>
     </TransitionDLL>
     </Transitions>
     </TransitionsAndEffects>
   • Copy it, and paste it into notepad.  
     1. Click File>Save As, and navigate to C:\Program Files\Movie Maker\Shared\AddOnTFX.
     2. If you don't already have an AddOnTFX folder, right click then New>Folder.
     3. In the drop-down "File type" box, select "All types". Save the file as "greenscreen.xml"
   • Run Windows Movie Maker.
   • Import the video of your subject into WMM, and drag it down to the timeline.
   • Find the picture or video you want to show behind your subject. #*# Import it into WMM, and drag it down to the time line to the left of the video with your subject in front of the blue screen.
   • Now that you have your two videos, click "Greenscreen".  
     1. Drag it down to the timeline.
     2. Click the video of the greenscreen and drag it over onto the other clip.
     3. Don't drag it to far because that will just make the clips switch places.
     4. Keep going until the blue triangle disappears.
   • Click File>Save Movie File to save your movie.
2. 3
   Method 2:
• Download additional software from a reputable source.  
  1. There are several websites that have created applications that streamline this process.
  2. Photostudiosupplies.com, for example, has download-able chroma key software, but for only specific backdrops.
• Once downloaded, open the Windows Movie Maker video you would like to superimpose over the backdrop.
• Drop the video and the downloaded chromakey into the timeline.
• Adjust in the timeline so the images sync up.
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4. From:http://www.wikihow.com