How Bendigo Is Tackling the Duplicate Image Problem — and Where It Stands Against Cities Worldwide

Bendigo's major cultural repositories are mid-way through a coordinated audit of their digitised holdings, targeting the persistent problem of duplicate image files that inflate collection databases, confuse researchers and waste storage budgets. The Bendigo Art Gallery on View Street and the City of Greater Bendigo's records management unit confirmed the joint effort is running under the broader Victorian Collections upgrade program, with a target completion date of December 2026.

The issue sounds mundane until you price it out. Cultural institutions in mid-sized Australian regional cities typically carry duplicate rates of between 15 and 30 percent across digitised photographic collections, according to digitisation benchmarking work published by the Australian Institute for the Conservation of Cultural Material. Every redundant file costs money to store, index and migrate during system upgrades. For a gallery or archive operating on a regional council budget, that overhead adds up fast.

The timing is pointed. Cultural institutions across Europe, North America and Southeast Asia accelerated mass digitisation programs during the 2020–2022 pandemic period, scanning whatever they could with whoever was available. Speed produced volume; volume produced duplication. Bendigo was no different. The Goldfields Library Corporation, which serves the greater Bendigo region from its hub on Hargreaves Street, estimates it processed several thousand local history photographs during that period — a workflow that left the collection with unresolved duplicates across multiple catalogue entries.

What Bendigo Is Doing Differently

The local strategy leans on perceptual hashing — an automated technique that generates a compact numerical fingerprint for each image, allowing software to flag near-identical files even when file names or metadata differ. That approach is now standard in large metropolitan institutions like the State Library Victoria and the National Library of Australia. What makes the Bendigo model notable is its application at the regional scale, running on Victorian Collections infrastructure rather than bespoke enterprise software that smaller bodies cannot afford.

The Bendigo Art Gallery is working through roughly 12,000 digitised records in its permanent collection. Staff are cross-referencing automated flags against physical condition reports before deleting any file, a step that larger institutions sometimes skip under time pressure. The Goldfields Library's local history division is running a parallel but separate process, with volunteers from the Bendigo Historical Society on Pall Mall assisting with manual verification of flagged pairs where metadata is ambiguous or the subject matter involves Aboriginal cultural material requiring additional sensitivity protocols.

That last point matters. Duplicate management intersects directly with cultural heritage protection. Under Victorian Aboriginal Heritage Act obligations, mislabelled or duplicated images of sacred sites or ceremonial material cannot simply be bulk-deleted by algorithm. Each flagged item involving potentially sensitive content goes to Dja Dja Wurrung Clans Aboriginal Corporation for review before any action is taken — a step that several comparable regional programs in New South Wales and Queensland have not built into their workflows.

How Bendigo Compares Globally

Internationally, cities of roughly comparable population and institutional scale offer a useful benchmark. Inverness in Scotland, home to around 50,000 people and a regional archive serving the Highlands, completed a duplicate-reduction program in 2024 using open-source software developed by the Swedish National Heritage Board. The project cut their digitised photographic holdings by around 18 percent. Évora in Portugal, a UNESCO-listed city with a similar regional archive profile, is still in planning stages.

Bendigo's hybrid model — automated detection combined with manual cultural review — mirrors what Christchurch City Libraries in New Zealand implemented after its post-earthquake recovery digitisation program generated significant duplication. Christchurch found the manual verification layer added roughly 40 percent to project time but reduced errors that would have required expensive remediation later.

For Bendigo residents who use the local history collections at Hargreaves Street or access the Victorian Collections portal online, the practical effect will be a cleaner, faster search experience by mid-2027 at the earliest — assuming the December 2026 audit phase finishes on schedule. The Bendigo Art Gallery's online catalogue, accessible through its View Street website, is expected to reflect the cleaned records in a staged rollout beginning early next year. Researchers with active projects should contact the gallery's collection team directly to flag any records they are currently citing, in case those catalogue numbers change during the deduplication process.