Overview
ISO/TR 12033:2009 - Document management - Electronic imaging - Guidance for the selection of document image compression methods - is an ISO Technical Report that helps users, electronic image management (EIM) integrators and equipment/software designers choose appropriate document image compression methods. It applies to still images in bitmap mode and covers compression algorithms based on well‑tested mathematical principles. The report explains how document type, digitization parameters and retention requirements affect the selection of compression methods for efficient storage and reliable reuse.
Key topics
- Document classification and digitization parameters
- Types: bi‑level (black & white text), grey scale (photo), mixed/halftone.
- Typical digitization guidance: 300 dpi commonly preserves visual quality for text; 8‑bit encoding for greyscale is typical.
- Compression methods and standards (overview of commonly used algorithms)
- Lossless: LZW, RLE, JBIG, ITU‑T Group 3/4 (T.4/T.6).
- Lossy / transform‑based: DCT/JPEG, wavelet/JPEG 2000, fractal, JBIG2.
- Trade‑offs and selection criteria
- Lossless vs lossy: lossless preserves exact original data; lossy can greatly reduce size but may degrade text legibility - not recommended for text or long‑term archival.
- Choose based on document content (text, photo, halftone), retention period, and downstream processing needs.
- Compression parameter selection
- Practical guidance for setting compression levels (e.g., JPEG quality, resolution decisions) to balance size and legibility.
Applications and users
- Who benefits:
- EIM integrators selecting compression for scanning and storage systems.
- IT buyers and end users evaluating hardware or software with embedded compression.
- Imaging equipment and software designers planning supported algorithms and parameters.
- Practical use cases:
- Archiving legal, financial or administrative documents where text legibility and long‑term retention dictate lossless or conservative settings.
- High‑volume document capture workflows using JBIG/JBIG2 or ITU‑T facsimile algorithms for bi‑level text.
- Photo‑centric archives and color documents using JPEG or JPEG 2000 (wavelet) for efficient grayscale/colour compression.
Related standards
- ISO 12651:1999 (electronic imaging vocabulary)
- ITU‑T Recommendations T.4 and T.6 (Group 3/4 facsimile)
- ISO/IEC 10918 (JPEG family)
- ISO/IEC 11544 (JBIG)
- ISO/TR 12033:2009 itself is a Technical Report providing informative, practical guidance rather than normative requirements.
Keywords: ISO/TR 12033:2009, document image compression, electronic imaging, EIM, JBIG, JPEG, JPEG 2000, lossless compression, lossy compression, bitmap, dpi.