Overview
ISO 12650:1999 is an international standard developed by the International Organization for Standardization (ISO) that specifies special requirements for the microfilming of achromatic maps on 35 mm microfilm, either in roll form or aperture cards. Designed specifically for document imaging applications, this standard supplements related ISO microfilming standards by addressing the unique challenges involved with achromatic maps, such as their thinner lines and finer details compared to typical technical drawings.
By establishing precise guidelines on reduction ratios, resolution, and quality control, ISO 12650:1999 ensures reliable, legible, and high-quality microfilm reproductions of achromatic maps for archival and reference purposes.
Key Topics
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Scope: Covers the microfilming requirements specifically for achromatic maps-maps with a white or near-white base printed using spectrally neutral media-on 35 mm microfilm formats including rolls and aperture cards.
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Reduction Ratios: Sets nominal microfilm reduction ratios at 1:24, 1:21.2, 1:15, 1:10, or 1:7.5, with recommendations to use the lowest possible ratio that fully accommodates the map frame for optimal legibility.
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Resolution Requirements: Defines minimum resolution standards based on ISO test charts to guarantee capture of all map details. Resolution varies according to reduction ratio and generation of film, ensuring critical map elements remain clear and readable.
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Quality Control: Adheres to silver-gelatin film quality criteria as established in ISO 3272-2, supplemented by requirements for aperture cards per ISO 3272-3. Includes detailed stipulations on test targets for verifying microfilm quality through visual and measurement checks.
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Test Targets: Specifies the design and components of the test target that must precede and conclude each microfilm roll. These include ISO test charts, reflectance targets with specific density ranges, reduction-ratio measurement strips, an identification card, and a precise orthogonal grid for positional accuracy.
Applications
ISO 12650:1999 is essential for organizations involved in the archival, storage, and reproduction of achromatic maps using microfilm technology. Its practical applications include:
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Government & Cartography Agencies: For preserving national, regional, and city planning maps in microfilm format with guaranteed accuracy and fidelity.
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Libraries & Archives: Assisting special collections and map depositories in microfilming maps for long-term storage and ease of access, reducing physical storage space while maintaining image quality.
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Surveying and Engineering Firms: Ensuring technical map reproductions meet stringent clarity requirements for fieldwork and project documentation.
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Micrographics Services: Providing standardized operating procedures and quality benchmarks for microfilm services specializing in map imaging.
By following ISO 12650:1999, organizations can confidently maintain high standards in the reproduction and legibility of achromatic maps, optimizing archival quality and accessibility.
Related Standards
ISO 12650:1999 complements and references several key ISO standards within micrographics and document imaging:
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ISO 3272 Series: Microfilming of technical drawings and other office documents - covers operating procedures (Part 1), quality criteria and control (Part 2), aperture card specifications (Part 3), and special sizes (Part 4).
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ISO 6196 Series: Micrographics vocabulary - clarifies terminology related to image quality, equipment, and methods.
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ISO 446: ISO character and ISO test chart No. 1 - essential for character size and resolution testing in microfilm.
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ISO 3334: ISO resolution test chart No. 2 - provides patterns used for resolution testing in microfilming.
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ISO 6199: Operating procedures specifically for microfilming documents on 16 mm and 35 mm silver-gelatin type microfilms.
These standards collectively support the implementation of ISO 12650:1999, ensuring consistent microfilm quality and compatibility across different types of document imaging applications.
Keywords: ISO 12650, microfilming achromatic maps, 35 mm microfilm, document imaging, map microfilming standard, reduction ratios, microfilm resolution, aperture cards, silver-gelatin microfilm, archival microfilm, ISO microfilm standards, map preservation, microfilm quality control.