Step-by-step Chroma key com­posit­ing

Windows 7 Help & Advice - - EXPLORE -

1 Pick a back­ground

First, you’ll need a plain back­ground. We’re lucky to have a green wall we can use, but there are other op­tions. It doesn’t even have to be green – the key re­quire­ment is that it’s a solid colour that’s dif­fer­ent from your sub­ject’s hair, skin, and any­thing they’re wear­ing. Blue and green are the most com­monly used colours. If you don’t have a suit­able wall, you can use coloured card or pa­per.

2 Get the right light­ing

The back­ground should be evenly lit to avoid harsh shad­ows. One of the eas­i­est ways to achieve this is to shoot your video dur­ing the day, in nat­u­ral light, mak­ing sure you’re not stand­ing di­rectly in front of a win­dow. You might need to ex­per­i­ment with clos­ing the cur­tains or blinds, and po­si­tion­ing your­self in dif­fer­ent places around the room.

3 Record your video

Next, record your video. It’s a good idea to use a tri­pod to keep the cam­era steady, or ask the per­son who’s do­ing the record­ing to lean against some­thing sturdy and sta­ble like a piece of fur­ni­ture or a wall. Once you’re happy, trans­fer the video to your PC in the same way you would nor­mally – wire­lessly or us­ing a USB ca­ble – and then go to www.shot­cut.org.

4 Get Shot­cut

Click the red ‘Click to down­load’ link at the top of the page, then choose ei­ther the 32-bit or 64-bit in­staller, de­pend­ing on your ver­sion of Win­dows. If you’re not sure which to choose, fol­low the in­struc­tions from Mi­crosoft at http://bit.ly/2rtEwhG. Once it’s down­loaded, run the in­staller, leav­ing all the de­fault op­tions se­lected, then launch the pro­gram.

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