The Digital Fact Book - Quantel

LetterboxA method used to show higher aspect ratio (e.g. 16:9) images on a low aspect ratio(e.g. 4:3) display. While all the contents of the pictures can be seen there are stripsof (usually) black above and below the picture which some people do not like.16916:9 image34LSee also: 14:9, Anamorphic, ARCLevelSee MPEG-2LightsSee Printer lightsLinear (editing)The process of editing footage that can only be accessed or played in the sequencerecorded. Tape and film are linear in that they have to be spooled for access to any materialand can only play pictures in the order they are recorded.With spooling, jogging and pre-rolls, so called ‘mechanical considerations’, absorbingupwards of 40 percent of the time in a VTR edit suite, linear editing is slow for everydayediting. The imposition of having to record items to an edit master tape in sequence limitsflexibility forlateradjustments: e.g. inserting shots between existing material may involveeither starting the job again or re-dubbing the complete piece. For simple changes however,linear suites are still fast for tape-based material.See also: C-mode, Digital disk recorder, True random access119