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A cue mark, also known as a cue dot, a changeover cue〔The term "changeover cue" can refer to any cue mark, or it can also refer to the second cue in a pair (the one that actually signals the changeover).〕 or simply a cue is a visual indicator used with motion picture film prints, usually placed on the right-hand upper corner of a frame of the film.〔SMPTE 301M-1999. ''SMPTE STANDARD for Motion-Picture Film: Theater Projection Leader, Trailer and Cue Marks.'' Society of Motion Picture and Television Engineers. White Plains, NY.〕 Cue dots are also used as a visual form of signalling on television broadcasts. A pair of cue marks is used to signal the projectionist that a particular reel of a movie is ending, as most movies come to theaters on several reels of film lasting about 14 to 20 minutes each. The marks appear in the last seconds of each reel; the first mark, known as the motor cue, is placed about 8 seconds before the end of the picture section of the reel. The second mark, known as the changeover cue, is placed about 1 second before the end. Each mark lasts for 4 frames (0.17 seconds). Coded Anti-Piracy is a different kind of mark, used for watermarking to detect and prevent copyright infringement. ==Placement== The exact placement of cues varies somewhat from lab to lab. According to SMPTE-301〔 (Theatre Projection Leader), there shall be 4 frames of motor cue, followed by 172 frames of picture, followed by 4 frames of changeover cue, followed by 18 frames of picture. That puts the motor cue at frames 198–195 from the end of the picture section of the reel (12.34 to 12.15 feet; or 12-foot-6-frames through 12-foot-3-frames), and the changeover cue at frames 21–19 from the end (1.31 to 1.18 feet; or 1-foot-5-frames through 1-foot-3-frames). As of January 2005, most domestic United States release prints follow this standard. According to SMPTE-55〔SMPTE 55-2000. ''SMPTE STANDARD for Motion Picture Film: 35- and 16-mm Television Release Prints -- Leaders and Cue Marks.'' Society of Motion Picture and Television Engineers. White Plains, NY.〕 (SMPTE Universal leader), there shall be 4 frames of motor cue, followed by 168 frames of picture, followed by 4 frames of changeover cue, followed by 24 frames of picture. That puts the motor cue at frames 200–197 (12.47 to 12.28 feet; or 12-foot-8-frames to 12-foot-5-frames) from the end of the picture section of the reel, and the changeover cue at frames 28–25 (1.75 to 1.56 feet; or 1-foot-12-frames to 1-foot-9-frames) from the end. Prior to January 2005, domestic United States release prints printed by Deluxe Laboratories (about half of domestic first-run major releases) followed this standard. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cue mark」の詳細全文を読む スポンサード リンク
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