ISO 4241 pdf download

ISO 4241 pdf download Cinematography — Theatre projection leader, trailer and cue marks — Specifications
Scope
This International Standard specifies the makeup or assembly of time-based leaders and cue marks for70 mm, 35 mm, and 16 mm motion-picture release prints.
NOTE
Extraneous materials are dealt with in Annex A
2 Normative reference
The following documents, in whole or in part, are normatively referenced in this document and areindispensable for its application, For dated references, only the edition cited applies. For undatedreferences,the latest edition ofthe referenced document (including any amendments) applies.
SO 4238:1976,Cinematography – 0ptical printing ratios for enlargement and reduction of motion-picturefilm images – Specifications
3 Reduction ratio
The reduction ratio in the production of the head and foot leaders from 35 mm motion-picture film to16 mm motion-picture film shall be in accordance with ISO 4238.
General specifications
4Orientation and dimensions ofletters and numerals in this International Standard are with respectto 35 mm motion-picture films and are modified proportionally in accordance with ISO 4238 for 70 mmand 16 mm prints.
4.2Information appearing in the leader which is printed lengthwise (in the direction of film travelshall read from left to right when viewed from the projection lens towards the projector light source withthe head end of the film at the right. Information appearing in the leader which is printed upright shallread normally when the reel is uppermost and the head of the film hangs down ready for threading (seeFigures 1 and 5 for orientation of information)
4.3 All frames in the head-leader and trailer-leader identification sections (see 5.3 and 7.3) and inframes 1 through 171 of the head-leader synchronizing section (see 5.4) shall be masked to the nominalanamorphic projection aperture (20,95 mm (0,825 in) x 17,53 mm (0,690 in)] with clear framelinesnominally the height of anamorphic projection aperture framelines (1,55 mm (0,061 in)]. Frames 172through 218 ofthe head-leader synchronizing section and frames 1 through 87 ofthe trailer-leader runoutsection shall be masked to the nominal anamorphic camera aperture (21,95 mm (0,864 in) x 18,59 mm(0,732 in) with clear framelines nominally the height of anamorphic camera-aperture framelines[0,41 mm (0,016 in)l.
4.4Because many types of film may be used for leaders, exact neutral densities have not been specified.For the purpose ofthis International Standard, the following approximate neutral densities are referred to:clear (neutral density less than 035);
5 Head leader (see Figure 1) 5.1 Protective section The protective section of the leader shall consist of a minimum of 2,44 m (8 linear feet) of transparent or raw stock. When the protective leader has been reduced to a length of 1,83 m (6 linear feet), it shall be restored to its original length. Logos, trademarks, part titles, or other extraneous materials, if absolutely necessary, should be placed in this section.