Like most of the technical black arts, the trick to good green screens is practice and experimentation.Įven if you don't plan on becoming a compositor, it will also help to watch a couple of keying tutorials to understand the issues they face. How do you suppose the compositing artist might have chroma-keyed the top of the actor's head, or those leaves in the background? Answer: with great difficulty (or a lot of rotoscoping, and additional CGI). This might sound like common sense, but you'd be surprised how often it doesn't happen. Ensure Your Screen Covers the Entire Area You’re Shooting There are very few occasions where this is necessary, and it often causes more problems than it solves. Green Does Not Mean InvisibleĪ compositor's biggest frustration is seeing a perfect screen set-up, then suddenly, a member of the crew runs in front of the actor dressed in (head-to-toe) green spandex, essentially ruining the shot. Depending on the lens, you’ll typically want around 25-30 foot depth for a full-length shot.Additional distance reduces how much ‘spill’ infects your subject (ie green light reflecting back from the screen, causing the actor’s skin to look pale and sickly).More space will let you light your screen, while then setting up more ‘arty’ lighting on your actor. Light separately: if you light the green background separately (bright and flat) from your actor, you’ll avoid them casting shadows (causing an uneven gradient) and any green hue bouncing off the subject, which causes problems when you’re removing the background.You might not have a lot of room, but try to make the most of whatever space you do have - ideally at least six feet between background and subject. Create as Much Space Between Screen and Subject as Possible Check out The Basic Filmmaker for his straightforward 3 min tutorial:Ģ. Once you've figured out which software you want to use, usually you can remove the green in a couple of steps. Removing the green screen in the editing proccess is often referred to as 'pulling the key' - hence the phrase, 'keying'. This term is used to describe the process of removing the green screen in post-production using editing software. Here's some of our top picks to get you started: There's a number of software out there than can help you acheive the perfect chroma key, the best one will ultimately be the one that you can use with ease. So, don’t forget, if you’re using green screen, then make sure your actor isn’t wearing anything green as part of their costume – a dress, or a tie, say – or you’ll end up with a transparent dress, or a tie-shaped strip down their front… What Is the Best Software for Chroma Key? The chroma key singles out the selected colour – the green – and digitally removes it by rendering it transparent. As every colour has a chroma range, this is where the phrase comes from. This refers to the actual technique of layering, or compositing, two images based on colour hues. It's not as easy as just pitching up big green rectangular sheet.there are couple elements involved that once you've nailed, will make shooting with green screens a smooth process. Why the switch to bright green? Well, it’s the colour furthest away from human skin tones. The technique originally dates back to the 1900s, when blue screens were used, as it worked better with celluloid film. Put simply, you’re superimposing one image or video stream over another, so it looks like one image. It’s usually a single coloured backdrop that an editor removes from the shot, to drop in other-worldly backgrounds or effects. ‘Green screen’ is a VFX technique, where two images or video streams are layered, or composited, together. In this article, we'll be going through everything you need to know about shooting with green screens. It’s practically impossible to be working in today's video/film/television industry and not wind up needing to chroma-key using a green (or blue, or even black) screen at some point. During Demis Lyall-Wilson’s career as a Hollywood VFX artist, he’s seen an awful lot of green screens.
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