| 摘要 |
Red, green, and blue signals from a video camera are separately recorded. In preparation for this, the three signals (advantageously generated at twenty-four frames per second and more than 655 noninterlaced raster lines per frame) are first applied to three separate low-pass filters, which pass up to at least eight and preferably more than fourteen megahertz. The filter output signals then frequency modulate three separate carriers, each of frequency at least two megahertz greater than the filter passband. The three frequency-modulated carriers are simultaneously recorded on parallel tracks. The three separately recorded FM carriers are subject to editing, traveling-matte combination with other triplets of carriers, and other special effects-while preserving wideband detail. The final three-track recording is used to generate a widescreen color film negative: The tracks can be conformed into a single monochrome video track, with each set of three color frames placed in sequence. This track is used in an electron-beam recorder to make a monochrome film, in turn used to create a color film negative or positive-by the dye-transfer process, or by exposing color negative stock to primary color lights through the monochrome frames. Alternatively the three-color film can be prepared directly from the three-track video tape by use of a three-light-beam apparatus that scans the film under control of the video recordings-preferably scanning only across the film, while the film is continuously advanced. Resulting film resolution can exceed that of conventional widescreen film.
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