Since Q@mera outputs video with an Alpha channel (transparency), we thought it might be possible to create sophisticated overlay video effects (called compositing) using Q@mera and iMovie 09. It is possible. But there are some hurdles.
1. Since iMovie 09
does not recognize the Q@mera virtual camera as an input, you must use either iMovie HD
(free download) or QuickTime Player Pro
to record the Q@mera output to a movie.
2. iMovie 09
does not appear to recognize the alpha channel in a movie, so we need to fudge it.
3. First, make sure the advanced iMovie 09
preferences are set (allows greenscreen feature).
4. Take any template in Q@mera that creates a transparent effect (like the Polaroid effect) and turn the background color on, and set it to a medium green color.
5. Record your movie with iMovie HD
or QuickTime Pro
6. Export your movie to Apple TV
or Apple Intermediate codec
and import your movie into iMovie 09. This step is important because iMovie 09
will not greenscreen a movie with an ARGB codec. It also may be helpful to export at the same resolution as your iMovie 09
project (ie. 1080 HD).
7. Select your new movie and drag it on top of an existing clip already positioned in the iMovie 09 timeline.
8. A popup menu will appear: Choose 'Greenscreen' and iMovie 09
will make the green background transparent.
Labels: imovie 09