Matte (filmmaking) in the context of "Didymium"

The Great Train Robbery is a 1903 American silent Western action film made by Edwin S. Porter for the Edison Manufacturing Company. It follows a gang of outlaws who hold up and rob a steam train at a station in the American West, flee across mountainous terrain, and are finally defeated by a posse of locals. The short film draws on many sources, including a robust existing tradition of Western films, recent European innovations in film technique, the play of the same name by Scott Marble, the popularity of train-themed films, and possibly real-life incidents involving outlaws such as Butch Cassidy.

Porter supervised and photographed the film in New York and New Jersey in November 1903; the Edison studio began selling it to vaudeville houses and other venues in the following month. The cast included Justus D. Barnes and G. M. Anderson, who may have also helped with planning and staging. Porter's storytelling approach, though not particularly innovative or unusual for 1903, allowed him to include many popular techniques of the time, including scenes staged in wide shots, a matte effect, and an attempt to indicate simultaneous action across multiple scenes. Camera pans, location shooting, and moments of violent action helped give The Great Train Robbery a sense of rough-edged immediacy. A special close-up shot, which was unconnected to the story and could either begin or end the film depending on the projectionist's whim, showed Barnes, as the outlaw leader, firing his gun directly into the camera.

Anamorphic format is a cinematography technique that captures widescreen images using recording media with narrower native aspect ratios. Originally developed for 35 mm film to create widescreen presentations without sacrificing image area, the technique has since been adapted to various film gauges, digital sensors, and video formats.

Rather than cropping or matting the image and discarding visual information, anamorphic capture employs cylindrical lenses to horizontally compress or "squeeze" the image during recording. A complementary lens is then used during projection to expand the image back to its intended widescreen proportions. By utilizing the full height of the film frame or sensor, this method retains more image resolution than cropped non-anamorphic widescreen formats. Anamorphic lenses have more complex optics than standard spherical lenses, which require more light and can introduce distinctive distortions and lens flares. However, these artefacts are sometimes deliberately embraced for their aesthetic appeal.

In computer graphics, alpha compositing or alpha blending is the process of combining one image with a background to create the appearance of partial or full transparency. It is often useful to render picture elements (pixels) in separate passes or layers and then combine the resulting 2D images into a single, final image called the composite. Compositing is used extensively in film when combining computer-rendered image elements with live footage. Alpha blending is also used in 2D computer graphics to put rasterized foreground elements over a background.

In order to combine the picture elements of the images correctly, it is necessary to keep an associated matte for each element in addition to its color. This matte layer contains the coverage information—the shape of the geometry being drawn—making it possible to distinguish between parts of the image where something was drawn and parts that are empty.

Letter-boxing is the practice of transferring film shot in a widescreen aspect ratio to standard-width video formats while preserving the film's original aspect ratio. The resulting video-graphic image has mattes of empty space above and below it; these mattes are part of each frame of the video signal.