So I'm going to save this to the Desktop and call it Green and Export it. This is only going to be a temporary file. In this case 720 for the video I'm using but, you know, typically you want to go 1080 and you might want to go Best Quality too.

I'm going to go to File, Share, and I'm going to Export as a File and I'm going to go to the highest resolution as I can. Notice that they're different shades of green. So I end up with me on a green background like that. I'm going to replace the background there with green and make sure it stretches to fill the entire clip here. So I'm going to go to Backgrounds and I'm going to scroll up and there is a green background that's included by default. Now that I've got that what I want to do is I want to replace this background here with a green background. It could be anywhere but the bottom right hand corner for this example. But I'm going to just do it really simply here and put myself in the bottom right hand corner. So this could be something where you could, you know, be in a certain portion of the picture or be doing something in particular. I position it where I want and make it the size I want. So it's going to have the green background. I would change this to picture-in-picture. There's no direct way to do it in iMovie but you can do it in two steps. So what if I wanted to position myself, say I was in the lower right hand corner, but I also had Green Screen on. Or I could set it to Green Screen and then it cuts out the background. Because I could take a clip like this clip here and I can stick it above a clip, just a simple background and I could set it to picture-in-picture, so I use here I go to picture-in-picture, and then I could position it somewhere.

It's how do you combine the mobility of picture-in-picture in iMovie with Green Screen. Video Transcript: Here's a question somebody asked me recently and I found others online had the same question as well. Check out Resizing and Positioning Green Screen Video In iMovie at YouTube for closed captioning and more options.

How to use green screen imovie