Computer-generated imagery
Compositing techniques known as chroma keying that remove all areas of a certain color from a recording - colloquially known as "bluescreen" or "greenscreen" after the most popular colors used - are probably the best-known and most widely used modern techniques for creating traveling mattes, although rotoscoping and multiple motion control passes have also been used in the past. Computer-generated imagery, either static or animated, is also often rendered with a transparent background and digitally overlaid on top of modern film recordings using the same principle as a matte - a digital image mask.