Note: While the software is classified as free, it is actually donationware. You can do much better keys in post-production software.) Now you can see your actor composited on top of your background! Click on the live video image to choose your key color and load a Quicktime background file (movie or still image).
Now it's simple: Run the Firewire output from your camera into a laptop running Chroma Key Live. This leads to a problem: How do you visualize the composited image on-set when all you can see is the actor against a green screen? Modern digital video is shot without the support of an analog studio, so the chroma key is created afterwards inside the computer.
This way, the production team could see exactly how the actor looked when composited over the background image. In the days of analog video, the camera's live signal was routed through a keyer in the control room and delivered back to an on-set monitor. It’s unclear whether these devices will continue to have feature parity after iOS and iPadOS split off this fall, as Apple may have special plans for iPad users, perhaps including even greater feature overlap with the same-named Mac app.Chroma Key Live is a free tool to generate a live "green screen" composite (AKA "chroma key") during a video shoot. IMovie 2.2.7’s new features are available now as a free iOS App Store update for both iPhones and iPads, with no special differences besides standard screen layout variations between the two devices. PIP and split-screen borders can also be removed so that the overlaid images aren’t as obviously separated from the rest of the content, if you wish.
The new update also supports the addition of logos or custom graphics to videos using still images with transparent backgrounds, and overlaid photos for picture-in-picture and split-screen effects. As before, you can also choose music to match iMovie’s built-in themes, and access your own music library to use in the backgrounds of videos. Version 2.2.7’s 80 new soundtracks span genres ranging from “action” and “chill” to “playful,” “pop,” “retro,” and “sentimental,” with a separate section for holidays and events.
Even so, the same or much less complex technology could be applied to pre-recorded videos being processed by iMovie. It’s worth mentioning that Apple acquired real-time green screen developer Spektral last year, though the technology was expected to be used for augmented reality rather than video editing, since it works while shooting live video at up to 60 frames per second.
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