Newcastle City Council confirmed this week that a sweeping audit of its digital image library has uncovered more than 14,000 duplicate files across the civic heritage collection, a problem administrators say traces back to at least 2009 when multiple departments began uploading photographs independently to separate content management systems. The result: identical images catalogued under different metadata, occupying server space that costs ratepayers money and making reliable searches for historical records close to impossible.
The timing matters. The council is currently digitising a further 30,000 physical photographs from the Newcastle Region Library's Local Studies collection on Laman Street, a project funded under the NSW Government's $4.2 million Regional Cultural Fund round announced in March 2025. Pouring new material into a broken system, archivists warned in an internal briefing obtained by The Daily Newcastle, risks compounding a problem that has quietly accumulated for nearly two decades.
A Long Road to This Mess
The duplication problem has roots in decisions that once seemed sensible. When Newcastle City Council merged with Lake Macquarie-adjacent administrative units and expanded its digital operations through the 2010s, each branch — heritage, tourism, planning, communications — maintained its own image folders. The council's IT framework at the time ran on legacy SharePoint infrastructure and lacked any deduplication protocol. A photograph of the BHP steelworks demolition in 1999, for example, exists in the current system under at least seven separate file names across four different folders, according to the audit summary.
The University of Newcastle's Digital Humanities Lab, based at the Callaghan campus, flagged the fragmentation problem in a 2021 collaborative project with council staff. That project, called HunterTrace, was designed to build a publicly searchable archive of industrial transition imagery — particularly photographs documenting the coal and steel sectors as those industries contracted. Researchers found that roughly 38 percent of images contributed by council were already present in some form in the library's own holdings, often scanned at different resolutions from the same original print.
Newcastle Regional Museum on Wood Street ran into a parallel issue. Staff there spent roughly six months between 2022 and 2023 manually cross-referencing their photographic database against the council's holdings before a joint exhibition on the Hunter coalfields could proceed. That manual reconciliation cost an estimated 480 staff hours, work that a functioning deduplication system would have rendered unnecessary.
What the Audit Found — and What Comes Next
The current audit, commissioned in February 2026 and completed in late June, used open-source perceptual hashing software to compare images pixel-by-pixel rather than relying solely on file names or metadata tags. That approach caught near-duplicates — photographs taken seconds apart, or the same print scanned twice at slightly different angles — that a simple filename check would miss. Of the 14,000-plus flagged files, auditors estimate around 9,200 are true duplicates requiring deletion or consolidation, while the remainder are genuine variants worth retaining.
The council's Digital Information Governance Policy, last updated in 2019, contains no specific provision for image deduplication. A revised policy framework is expected to go before the Infrastructure and Assets Committee in September 2026. Separately, the NSW State Archives and Records Authority issued updated digital preservation guidelines in April this year that explicitly require local councils to implement deduplication checks before bulk uploads to any public-facing repository.
For residents and researchers, the practical upshot is a period of disruption before things improve. The Laman Street digitisation project has been paused on new uploads since mid-June while the audit findings are processed. Council staff say the backlog should clear by October, at which point the library plans to make approximately 8,000 newly processed images publicly accessible through its online catalogue. Anyone with a specific research need in the meantime can submit a request through the Local Studies reading room, which remains open Tuesday through Saturday, 10am to 5pm. Given how long it took to reach this point, a few extra months to get the foundation right seems a reasonable trade.