| Checking significant properties of images have been retained after migration
| Detailed description
|| When we convert images between formats to create preservation or dissemination versions, we would like some way of checking if the conversion is successful (other than by just checking a random few by eye). Would be great if there could be a way that certain quantifiable properties of raster image files could be extracted and compared.
- number of pixels
- presence and content of metadata
This would be useful for conversions between jpg/tif/gif/png and possibly other formats too.
| Issue champion
|| Jenny Mitcham
| Other interested parties
| Any other parties who are also interested in applying Issue Solutions to their Datasets
| Possible Solution approaches
|| A tool already exists that characterises JPEG2000 files. JPanalyser? Need similar tools for other raster image file formats
|| 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
|| Archaeology Data Service archive
|| Reference to the appropriate Solution page(s), by hyperlink
Apr 17, 2012
Johan van der Knijff
From the description of this issue I'd suggest to check out ExifTool. It supports dozens of (mostly raster image) formats. Probably more than sufficient for what you need here.
Apr 18, 2012
Yep. This issue seems to be a reasonably common one, but we didn't have sufficient dev time to take this on at this mashup. It originally looked like Maurice's issue would require a solution of this kind, but it turned out it was all bad pixels rather than TIFF integrity/construction problems (see comments here http://wiki.opf-labs.org/display/SPR/Malformed+TIFF+images the related issue and solution pages). Thanks again for the comments Johan! Its good to have your remote support!