Autodesk 64006-051108-9001 User Guide - Page 270

262 Glossary Lossy - compression in which information is lost. Saving a file repeatedly with lossy compression will additionally degrade the image quality. This degradation is known as "generation loss." For example, Cinepak is a lossy codec. Luminance - brightness component of an image. Mac OS - Apple Macintosh Operating System. Marker - EventStream event that is not encoded but is merely used as a placeholder for assigning future events or for notations within the EventStream Editor. Master Movie - when making QuickTime alternate movies, the master movie is the one that contains the display criteria for the other alternates as well as containing the fallback. The master movie is the one that should be embedded in a Web page. Media - In the context of this manual: Elements such as movies, sounds, pictures (multimedia). Items used for storage or transmission, such as tapes, diskettes, CD-R's, Zip™ disks, networks, etc. Metadata - additional identification information, such as title, author and copyright, attached to a movie that is made visible by applications that can read it, such as QuickTime Player, RealPlayer and Windows Media Player. Metadata is usually accessible to viewers within the media player's file information dialog. MIDI (Musical Instrument Digital Interface) - architecture that is used to instruct electronic instruments how to play a piece of music - think of MIDI files as "PostScript" for music. QuickTime supports a data type called QuickTime Music that is very similar to MIDI. QuickTime can easily convert MIDI files into QuickTime Music.