Step 2: Find or capture an image or video to use as an underlay. The video doesn’t need to be anything important, so just stand in front of the camera, say a few words, and move about on the screen. So find something to utilise as green screen this could be a boldly coloured sheet or wall if necessary. You need some video footage to be able to play with. Step 1: Capture footage in front of a green screen Depending on what colour screen you use, make sure that the person isn’t wearing anything of a similar colour as the software will remove this too. Blue and green are most commonly used as they differ most distinctly from most human skin colours. The first thing to take into account is that although I say green screen, it doesn’t actually matter what colour background you wish to use is, as long as it is a single solid colour and that it doesn’t match the colour of the main objects of the shot. What I am going to show you now, is how to do this simply using iMovie on your Mac. The above example is slightly more complicated and for me involved using more professional software. The other benefit of doing it this way, is that it allows me to use the same shot of the monitor, but alternate the image that appears on it if I wish to use it across a variety of videos.

I use a form of chroma keying or green screening to resolve this, by blue tacking green card to the monitor when taking a photo or video, and then removing the colour from the screen and replacing it with a chosen image.

If you have tried taking a photo or video of a PC monitor before, you have probably noticed that you end up with footage that ends up covered in horizontal lines, flickering all over the place. A certain colour on your top layer of video is made transparent to reveal another video or image placed behind it.īelow is an example of how I utilise a green screen. Green screening, otherwise known as chroma keying or chroma key compositing, is a special effects technique for replacing a single colour of part of a video or image, with another video or image. In this blog I will be providing you with a step by step guide on how to overlay an image or video content onto a video that is using a green screen.

Green screen imovie mac