BS ISO 4241:2019 pdf free.Cinematography一Projection film leader (time-based), trailer and cue marks – Specifications.
Orientation and dimensions of letters and numerals in this document are with respect to 35 mm motion-picture films and are modified proportionally in accordance with ISO 4238 for 70 mm and 16 mm prints. .Information appearing in the leader which is printed lengthwise (in the direction of film travel)
shall read from left to right when viewed from the projection lens towards the projector light source with the head end of the film at the right. Information appearing in the leader which is printed upright shall read normally when the reel is uppermost and the head of the film hangs down ready for threading (see
Figures 1 and 5 for orientation of information). All frames in the head-leader and trailer-leader identification sections (see 6.3 and 8.3) and in frames 1 through 171 of the head-leader synchronizing section (see 6.4) shall be masked to the nominal anamorphic projection aperture [20,95 mm [0,825 in) x 17,53 mm [0,690 in]] with clear framelines nominally the height of anamorphic projection aperture framelines [1 ,55 mm (0,061 in)].  Frames 172 through 218 of the head-leader synchronizing section and frames 1 through 87 of the One additional frame shall follow with the inverted upright words“SPLICE HERE” as shown in Figure 1, and an arrow pointing to a clear frameline between frame 218 and this frame to indicate where the synchronizing section joins the picture section. The clear letters should be at least 3,2 mm (1/8 in) high printed on a black background.7.2 Motor cue . The motor cue shall consist of black circles or clear circles, printed from a negative, which has had four consecutive frames marked as shown in Figures 6, 7 and 8 for 16 mm, 35 mm, and 70 mm films, . respectively. The position and dimensions of this mark shall be as given in Table 1. Following the four frames containing the motor cue, there shall be 172 frames to the beginning of the changeover cue. . 7.3 Changeover cue The changeover cue shall consist of four frames containing circles of the same dimensions and position on the frame as those in the motor cue. Following the four frames of the changeover cue, there shall be 18 frames to the beginning of the runout section of the trailer. 8.1 Splicing frame A single frame with the upright words“SPLICE HERE” and an arrow pointing to the clear frameline shall . precede frame 1 of the runout section to indicate where the runout section joins the picture section. The clear letters should be at least 3,2 mm (1/8 in) high printed on a black background. 8.2 Runout section The runout section of the trailer shall consist of 88 frames, the first 87 of which are to be black with framelines as described in 5.3. Frame 48 shall have an asterisk on the horizontal centreline adjacent to the sound track area. Frame 88 shall have the printed word “FINISH” nominally 9,5 mm (3/8 in) high in upright black letters on a clear background.BS ISO 4241 pdf download.