Overview
SIST ISO 12639:2004/Dodatek 1:2010 specifies an important amendment for the Tag Image File Format for Image Technology (TIFF/IT) standard within the field of graphic technology. This document details Amendment 1, which introduces the use of JBIG2-Amd2 compression for TIFF/IT, providing significant enhancements in prepress digital data exchange. JBIG2-Amd2, based on ISO/IEC 14492:2001/Amd.2:2003, offers advanced lossless compression for bi-level images, helping the prepress process in production-ready environments.
Key Topics
- TIFF/IT and Prepress Digital Data Exchange: Facilitates high-quality and consistent image data transfer within graphic arts workflows.
- JBIG2-Amd2 Compression Support: Introduces efficient lossless (and optionally lossy) compression tailored for bi-level images, such as halftones commonly used in printing.
- Image Types Supported: JBIG2-Amd2 is now applicable specifically to the TIFF/IT-BP (Binary Picture) and TIFF/IT-SD (Screened Data) image types.
- Codestream and Compatibility: Files using JBIG2-Amd2 must observe compatible field values and codestream structures as detailed in the amendment. Not all TIFF/IT variants support the new compression - use is limited to BP and SD formats as outlined.
- Segmentation Structure: Defines a segment-based structure (profiles, page information, immediate-lossless-generic-region, and end-of-page) for JBIG2-Amd2 codestreams within TIFF/IT, ensuring standardized decoding and interoperability.
Applications
SIST ISO 12639:2004/Dodatek 1:2010 has practical value in several graphic technology areas:
- Prepress Workflows: Allows print production and prepress operations to efficiently compress and exchange large bi-level images (such as halftones), boosting workflow speed and reliability.
- Digital Printing Systems: Enhances storage and transmission efficiency for high-resolution images in digital print solutions.
- Archival and Reproduction: Improves long-term storage formats for original digital artwork, ensuring that image integrity and quality are maintained with reduced file sizes.
- Cross-vendor Interoperability: By maintaining compliance with international standards and limiting compression use to supported image types, TIFF/IT files compressed with JBIG2-Amd2 can be reliably opened and processed across different software and hardware environments.
Related Standards
To fully implement or understand the amendments in SIST ISO 12639:2004/Dodatek 1:2010, review the following connected standards:
- ISO 12639:2004: The core specification for TIFF/IT, detailing its use in graphic technology and data exchange.
- ISO/IEC 14492:2001: Information technology standard for lossy/lossless coding of bi-level images, foundational for understanding JBIG2 methodology.
- ISO/IEC 14492:2001/Amd.2:2003: Amendment 2, which provides the technical basis for the adaptive templates used in JBIG2-Amd2 compression.
- ISO/IEC 11544: Covers progressive bi-level image compression, giving background on earlier bi-level image coding schemes used in imaging workflows.
By adhering to these standards, organizations in the printing and graphic arts industries can ensure optimal performance, compatibility, and future-proofing of their prepress digital imaging workflows. Integrating JBIG2-Amd2 compression in TIFF/IT per this amendment supports more efficient file handling and streamlined production from design to print.
