Checking significant properties of images have been retained after migration

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Title
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.
  • dimensions
  • number of pixels
  • presence and content of metadata
    ...etc

    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
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 Archaeology Data Service archive
Solutions Reference to the appropriate Solution page(s), by hyperlink
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2 Comments

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  1. 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.

    1. Apr 18, 2012

      Paul Wheatley

      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!