Using WMM to create a chroma key (GreenScreen / BlueScreen)December 6, 2009 at 11:29 pm | Posted in Techy stuff | 31 Comments
Using Windows Movie Maker (WMM for short) for green screen projects, baring in mind you need to make sure your green screen is actually green, or blue screen is actually royal blue!
I’ve used this technology with a ‘cornflour blue’ bed sheet and the effect, although it worked, was somewhat incomplete because of the light cast and the colour of the sheet. So before you start I have to recommend you get the right colour background, (which is more than likely available from fabric shops).
Ok so down to the nitty gritty, depending on what version of windows your running you may need to download an add on for windows movie maker 2 or higher.
There are three possible methods here, all depending on which version of movie maker you are running, although these steps may seem complicated, they are only a one off step in your movie making > honestly! promise!
The add on is called RehanFX shader and is completely freeware (no audit issues) http://www.rehanfx.org/download/SetupShaderTFX.msi < Download it here
Download it, install it, make sure you are using admin privileges. Although it says it runs on vista only it should work on the large majority of Windows XP SP 3 most schools are running. It’s really to do with the version of WMM your using (i would recommend the upgrade to 2 or 2.6 but not Windows Live Movie Maker, it lacks an abundance of features)
(As i’m writing this i’ve just found out that the windows 7 i’ve been running for 8 months doesn’t come preinstalled with WMM, just downloading and installing it!)
Once it’s installed you should be able to open WMM import your video with the blue/green screen AND import your video to become the back ground. (Make sure your in timeline view when placing them next to each other on the time line.)
If everything has gone to plan when you visit the transitions tab you should find several extra transitions these being ‘blue chroma 1, 2, 3 / green chroma 1, 2, 3’ and several others. (don’t worry about the others for now.) All you have to do is place the background video on to the timeline first, then place the video with the blue or green background on second, apply the chroma transition between the two videos, then drag the second video over the first (as if you wanted to make the transition longer, you should see a blue triangle appear across the videos, this means the effect is in place. If you drag it too far the videos will simply switch places, if that happens just try again.) Play the preview to view your effect.
If the RehanFX pack did not work try installing
and use the same method of placing both videos on the timeline, adding the transition in between and drag over. And preview to see the effect.
1. Record your subject in front of a well-lit blue or green screen, and transfer the video onto your computer.
2. Highlight the following xml code: (Source-windowsmoviemakers.net/forums)
3. Copy it, and paste it into notepad. Click File>Save As, and navigate to C:\Program Files\Movie Maker\Shared\AddOnTFX. (If you don’t already have an AddOnTFX folder, right click then New>Folder.) In the drop-down “File type” box, select “All types”. Save the file as “bluescreen.xml”
4. Run Windows Movie Maker.
5. Import the video of your subject into WMM, and drag it down to the timeline.
6. 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/green screen.
7. Now that your two video clips are in the timeline, go to your transitions and there should be one that says “Bluescreen”. Click it and drag it down to the timeline. Click the video of the bluescreen and drag it over onto the other clip. Don’t drag it to far because that will just make the clips switch places. Keep going until the blue triangle disappears, then go back just a hair. (It will make more sense when you try it)
8. Check out your preview and see if it worked.
9. Click File>Save Movie File to save your movie
Sorry if this seems rushed or incomplete, it was done in a very short space of time! I will try to add screen shots as soon as possible but off to bed now I’ve got school in the morning and it’s a new one! Gotta look good! :p