Overview
ISO 12639:2004 - Graphic technology: Prepress digital data exchange - Tag Image File Format for Image Technology (TIFF/IT) - specifies a media‑independent way to exchange raster image data in prepress and graphic arts workflows. Based on Adobe TIFF 6.0, the standard defines file formats for multiple image types (colour and monochrome), constrains TIFF features for interoperability, and adds capabilities such as support for spot colours, additional compressions, and a normative final‑page (FP) format.
Key topics and technical requirements
- Image file types defined: Colour continuous‑tone (CT), colour line‑art (LW), high‑resolution continuous‑tone (HC), monochrome picture (MP), binary picture (BP), binary line‑art (BL), screened data (SD) and final page (FP).
- Conformance levels: Full TIFF/IT, and two constrained profiles - TIFF/IT‑P1 (minimal subset, often compatible with TIFF 6.0) and TIFF/IT‑P2 (adds spot colours, SD, extended palette, extra compression).
- File structure & mandatory fields: Specifies required TIFF tag usage, field types and identification procedures so readers and writers interoperate.
- Colour spaces & precision: Normative guidance for RGB and CIELAB use in CT, and support for 16‑bit‑per‑channel data where applicable.
- Compression & embedding: Normative annexes cover incorporation of JPEG and Flate compressed data; SD supports CCITT G4 for copydot data.
- Colour management: Normative ICC Profile tag handling is specified to preserve device/scene colour intent.
- Palettes and separations: Expanded LW palette (up to 65 535 colours) and support for multiple spot separations (up to 32 separations cited in the standard).
Applications and who uses it
ISO 12639:2004 is practical for:
- Prepress and commercial printing houses exchanging raster assets between systems
- Graphic arts and publishing workflows needing media‑independent image exchange
- RIP vendors, image processing and layout software developers implementing interoperable TIFF readers/writers
- Color management and archival workflows where ICC profiles and high‑bit depth are required
- Automated production and final‑page assembly where FP files describe composite pages
Use cases include exchanging CMYK separations, line‑art palettes, high‑resolution images for plate making, screened copydot workflows, and transporting composite final pages between editorial and production systems.
Related standards
- Adobe TIFF 6.0 (base file format)
- ANSI IT8.8 (historical basis for earlier TIFF/IT work)
- ICC profile specifications (used via the ICC Profile tag in TIFF/IT)
For implementation and interoperability, consult the full ISO 12639:2004 text for precise tag definitions, conformance tests, and normative annexes (JPEG/Flate incorporation, RGB/CIELAB usage, ICC Profile tag).
