The Great Gatsby VFX reel shows just how much can be accomplished with green screen. Alternatively, you can paint a background with chroma key paint. There are several guides online to filming green screen video (also known as chroma key) and lots of places to buy green and blue screen backdrops. Green or blue are the colors most often used, mostly because of their difference from skin tones. The easiest way to do this is to film in front of a single color background, such as a screen or curtain.

Make a green screen videoįirst of all, you need to film your subject in a way that everything in the background can be 'removed' (made transparent) by subsequent processing. There are also proprietary tools to do the same job, such as Adobe After Effects, which you may find simpler. Encode to a video format (in this case, WebM).Process the video to build an array of PNG still images with transparency data.Film your subject in front of a single color background such as a bright green curtain.The method we describe uses the open source tools Blender and ffmpeg: Somewhat surreal, and a bit rough around the edges (literally) but you get the idea! # How to make alpha videos This means you can play videos with transparent backgrounds: over web pages, images or even other videos. In other words, Chrome takes the alpha channel into account when playing ' green screen' videos encoded to WebM ( VP8 and VP9) with an alpha channel. Chrome 31 now supports video alpha transparency in WebM.

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