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Truncated JPEG2000
| Title |
Truncated JPEG2000 |
| Detailed description | A detailed description of the Issue. The Issue MUST focus on the busines or preservation driven challenge, and should not assume or describe a particular solution. There has been post-scan processing of the original Tiff masters (For examplecropping and conversion to JPEG2000). Some of the processed JPEG2000 images have text that has become distorted and out of focus / illegible and in some extreme cases a 'checker board' pattern, see image below. We suspect that some of the files have become truncated and an extremely small file size, is some examples as much as 1KB. The issue is to be able to identify which of the images in this large collection have this particular problem. A tool is required to identify the faulty images. It should not be assumed that the original Tiff masters are still available, although for the sample set they currently are. It is not currently an aim to fix the images. |
| Issue champion |  Lynne Chivers |
| Other interested parties |
Gerben van der Meulen, International Institute of Social History, Amsterdam, NL. |
| Possible Solution approaches | Brief brainstorm of possible approaches to solving the Issue. Each approach should be described in a single sentence as part of a bulleted list |
| Context | Details of the institutional context to the Issue. (May be expanded at a later date) |
| Lessons Learned | Notes on Lessons Learned from tackling this Issue that might be useful to inform digital preservation best practice |
| Datasets | BL 19th Century digitised newspaper collection |
| Solutions | Reference to the appropriate Solution page(s), by hyperlink Identify Files Affected by Truncated-Fuzzy JPEG2000 Now solved by new software from SCAPE and OPF: http://openplanetsfoundation.org/software/jpylyzer  |
An example of a heavily truncated newspaper page. The original TIFF is on the left, the migrated JPEG2000 is on the right.