ISO 17332:2001

Overview

ISO 17332:2001 is an international standard published by the International Organization for Standardization (ISO) that specifies the manufacturer-printed latent image identification information for 35 mm motion-picture colour-print film. This standard defines the position, dimensions, content, exposure, and readability of human-readable latent images which are applied onto the film edges during manufacturing. It also sets requirements for spectral densities and reserves specific film areas for customer data recording such as soundtracks and timecodes.

This standard ensures consistent quality and functionality across motion picture colour-print films by setting clear guidelines for the latent image markings printed on the film edges, facilitating better film identification, traceability, and compatibility with downstream post-production processes.

Key Topics

• Latent Image Location and Format
  The latent image identification information is located on the printable edge of the 35 mm film, specifically in the margin between the edge and perforations. This "printed edge" is standardized to avoid interference with other critical data areas.

• Dimensions and Repeat Frequency
  The manufacturer decides the exact dimensions and repeat frequency of the latent image. Typically, the repeat frequency is 914 mm (36 inches) or less to maintain continuity and legibility along the film.

• Content of Latent Images
  Content may include film type, batch number, or other identification data as determined by the manufacturer. The latent image can also contain a control dot approximately 1.2 mm in diameter used for print density control.

• Exposure and Spectral Density Requirements
  Latent images are exposed onto the film’s blue and/or green-sensitive layers to avoid disrupting red-sensitive layers reserved for soundtracks and timecodes. The maximum permissible red density (D_min) after processing is 0.20 to prevent interference.

• Print Orientation and Readability
  The edgeprint's orientation can vary, allowing manufacturers to place the information in several readable positions when holding the film emulsion side up with the head toward the right. The latent images must be clearly readable in ordinary room lighting conditions.

• Reserved Areas for Customer Data
  The standard reserves the opposite film edge and areas between perforations as unexposed zones, ensuring space is available for customers to add soundtracks, timecodes, or other data in post-manufacture operations.

Applications

• Film Identification and Traceability
  The manufacturer-printed latent image provides essential metadata directly on the film, enabling identification of film type and batch details throughout the production and distribution chain.

• Quality Control and Process Monitoring
  The inclusion of control dots in the latent image supports monitoring of print density and exposure consistency, improving overall manufacturing quality assurance.

• Film Processing and Post-Production
  By standardizing the placement and exposure of latent images, ISO 17332:2001 enables filmmakers and technicians to efficiently manage film handling, soundtrack application, and editing while preserving crucial metadata integrity.

• Compatibility and Interoperability
  Adhering to this ISO standard helps manufacturers ensure 35 mm colour-print film remains compatible with global motion picture production equipment and practices.

Related Standards

• ISO 491:1995
  This standard specifies the cutting and perforating dimensions for 35 mm motion-picture film and magnetic film, which is referenced within ISO 17332:2001 to maintain consistency in film edge preparation.

• ISO/IEC Directives, Part 3
  Provides the framework for drafting and approving international standards like ISO 17332, ensuring broad consensus and authoritative relevance.

• Other Cinematography Standards
  Additional standards published by ISO Technical Committee ISO/TC 36 cover various aspects of film standards, including film base characteristics, safety film specifications, and digital cinema interoperability.

By implementing ISO 17332:2001, manufacturers and users of 35 mm motion-picture colour-print film can ensure reliable latent image identification, maintain quality control, and facilitate downstream data recording processes-critical factors in the global cinematic production workflow.