A simple JP2 file structure checker
Over the last few weeks I’ve been working on the design of a workflow that the KB is planning to use for the migration of a collection of (mostly old) TIFF images to JP2. One major risk of such a migration is that hardware failures during the migration process may result in corrupted images. For instance, one could imagine a brief network or power interruption that occurs while an image is being written to disk. In that case data may be missing from the written file. Ideally we would be able to detect such errors using format validation tools such as JHOVE. Some time ago Paul Wheatley reported that the BL at some point were dealing with corrupted, incomplete JP2 files that were nevertheless deemed “well-formed and valid” by JHOVE. So I started doing some experiments in which I deliberately butchered up some images, and subsequently checked to what extent existing tools would detect this.
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JHOVE
- Escape from the phantom of the PDF
- Multi-image TIFFs, subfiles and image file directories
- VeraPDF parse status as a proxy for PDF rendering: experiments with the Synthetic PDF Testset
- Identification of PDF preservation risks with VeraPDF and JHOVE
- PDF processing and analysis with open-source tools
- Breaking WAVEs (and some FLACs too)
- Why can't we have digital preservation tools that just work?
- A simple JP2 file structure checker
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JP2
- Generating lossy access JP2s from lossless preservation masters
- Jpylyzer 2015 round-up
- Response to report on JPEG 2000 expert round table
- Six ways to decode a lossy JP2
- Jpylyzer software finalist voor digitale duurzaamheidsprijs
- Optimising archival JP2s for the derivation of access copies
- ICC profiles and resolution in JP2: update on 2011 D-Lib paper
- Automated assessment of JP2 against a technical profile
- Update on jpylyzer
- Jpylyzer documentation
- A prototype JP2 validator and properties extractor
- A simple JP2 file structure checker
- Paper on JPEG 2000 for preservation
- Ensuring the suitability of JPEG 2000 for preservation
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jpeg-2000
- Generating lossy access JP2s from lossless preservation masters
- Jpylyzer 2015 round-up
- Response to report on JPEG 2000 expert round table
- Six ways to decode a lossy JP2
- Jpylyzer software finalist voor digitale duurzaamheidsprijs
- Optimising archival JP2s for the derivation of access copies
- ICC profiles and resolution in JP2: update on 2011 D-Lib paper
- Automated assessment of JP2 against a technical profile
- Update on jpylyzer
- Jpylyzer documentation
- A prototype JP2 validator and properties extractor
- A simple JP2 file structure checker
- Paper on JPEG 2000 for preservation
- Ensuring the suitability of JPEG 2000 for preservation
-
jpylyzer
- Generating lossy access JP2s from lossless preservation masters
- Jpylyzer 2015 round-up
- Jpylyzer software finalist voor digitale duurzaamheidsprijs
- Adventures in Debian packaging
- Automated assessment of JP2 against a technical profile
- Update on jpylyzer
- Jpylyzer documentation
- A prototype JP2 validator and properties extractor
- A simple JP2 file structure checker
