I wanted to send an elephant to a friend. The postage was pretty severe, so I got a life size picture of one instead. This was almost as good as the real thing, but it wouldn’t fit through her letterbox. So I got a postcard made up.
Read moreVideo Compression Explained, Or How To Squash An Elephant
Nowadays most of us are familiar with the idea that if someone is filmed against a flat, green (or blue) screen we can replace the green with a still image or video later on. This technique, more accurately known as chromakey, is a relatively straightforward process, which can be used with to good effect for executives or actors.