IPTC Photo Metadata Conference - Digital images and digital preservation

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@dart_ulcc http://dablog.ulcc.ac.uk Digital images and digital preservation IPTC Photo Metadata Conference, Zagreb, 2016 Ed Pinsent, ULCC
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Transcript of IPTC Photo Metadata Conference - Digital images and digital preservation

Moodle Presentation

Digital images and digital preservationIPTC Photo Metadata Conference, Zagreb, 2016

Ed Pinsent, ULCC

@dart_ulcchttp://dablog.ulcc.ac.uk

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About meDigital Archivist at ULCC since 2004Teaches digital preservation on the DPTPBackground as archivist / records managerExperience in web-archiving, repository management, metadata projects, migration, digitisation, project management, etc.See more at digital archives blog http://dart.blogs.ulcc.ac.uk/

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Digital preservationDigital preservation means ensuring sustained, continued access to your content, over along time; not just backing-upFor image collections, this might mean:Preservation of digital image filesPreservation (and continued management) of metadata

This presentation will define these targets of preservation, and propose some interventions

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Drivers for doing digital preservationYou might want it, e.g. To respond to threats caused by software changes / format changesTo respond to an entire system failureTo have a definitive preservation copy, in case of exports going wrong

If youre managing an image collection, then you might want to:Protect your workProtect your investmentRecognise that digitisation / image creation takes time and moneyRecognise that metadata curation takes time and money

Other possible scenarios:You have a user community whose needs you must meetYou have a commercial operation which would be strengthened by good preservation of the assets

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Production chainCreatorsDigital imagesArchived digital imagesAccess copies

Authoritative library-approvedMetadataOnline DAM

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Metadata creation - embeddedDigital imagesPhotographerImage softwareIPTC Metadata

EXIF Metadata

Technical MetadataCreators

Camera

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Metadata creation not embedded, descriptiveAuthoritative library-approvedMetadataOnline DAMDescriptive metadata

NamesTitlesDatesKeywordsPlaces

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Intervention 1: preservation storageArchived digital images

Fixity / checksum

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Long-term storageIdeally, wed want preservation-standard storageThis is not the same as backing-up a network, or storing content on HD / USB DrivesPreservation-standard storage is:Dedicated archival storageLittle if any network trafficFixity, validation, monitoring and reportingMultiple independent geo-redundant copiesA place to keep our master copies of digital images, probably hi-res images stored in lossless formats, so they have a big footprint

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FixityCrucial part of archival storage / long-term preservationMeans of detecting change or corruptionWe must generate a checksum for each fileChecksum = fingerprint of digital object; also called hash or fixityIf checksum changes, this is an indicator that object has changedRegular validation of checksums is strongly recommended

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Intervention 2: metadata management

Technical MetadataMetadata ExtractionArchived digital imagesPreservation Database

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Technical metadataMetadata about the digital image, very often embedded in the file headerHelps us identify the format with high degree of certainty