Bendigo Takes a Methodical Approach to Duplicate Digital Images — and It's Ahead of More Than a Few Bigger Cities

Bendigo's major public institutions are quietly working through one of the unglamorous but consequential problems of the digital age: archives clogged with duplicate and near-duplicate images that eat storage budgets, slow cataloguing staff and, in some cases, compromise the integrity of public cultural records. The Bendigo Art Gallery and Bendigo Regional Archives Centre — both located within a few blocks of each other on View Street and Pall Mall respectively — have each begun structured deduplication programs in the past 18 months, a process that peers in cities including Christchurch, Groningen and Valparaíso are still negotiating at the policy level.

The timing is not coincidental. Australian state and local governments are under renewed pressure to tighten digital asset management following Commonwealth guidance issued in late 2024 that flagged duplicate records as a compliance risk under the Archives Act 1983. For regional institutions with smaller IT teams, the practical problem is acute: a single digitisation sprint across a photographic collection can produce thousands of bracketed shots, colour-calibration frames and accidental duplicates that, left unaddressed, compound every year.

What's Actually Happening on the Ground in Bendigo

At the Bendigo Regional Archives Centre, staff have been working with a deduplication workflow built around perceptual hashing — a technique that compares image content rather than file names or metadata — to sort through holdings that span municipal records, historical survey photographs and community donation batches. The approach lets archivists flag near-identical images for human review rather than automated deletion, which matters when a pair of images that look identical to an algorithm may differ by a crucial stamp or annotation visible only on close inspection.

La Trobe University's Bendigo campus, on Edwards Road, has a parallel interest. Its library digitisation team supports several regional heritage projects and has been testing open-source deduplication tools since early 2025, partly to manage the photographic output of the Dja Dja Wurrung cultural heritage documentation work it supports in collaboration with the Dja Dja Wurrung Clans Aboriginal Corporation. Protecting the integrity of that material — and ensuring community-approved images are not accidentally multiplied or misattributed — gives the deduplication question a layer of cultural responsibility that a purely administrative archive does not face.

Bendigo Health, which has been expanding its capital footprint on Lucan Street, faces the same problem in clinical imaging administration, though its obligations under health privacy law create a different regulatory framework than the one public cultural institutions navigate.

How Bendigo Compares Internationally

Groningen, in the Netherlands, is a useful comparison. The city's municipal archive — managing a collection broadly comparable in age and civic scope to Bendigo's — only completed a formal duplicate-image policy in March 2026, according to publicly available records from the Groninger Archieven. Christchurch's post-earthquake digitisation effort, which produced an enormous volume of photographic records from 2011 onwards, is still working through deduplication at scale; the Canterbury Museum's 2025 annual report flagged the issue as an ongoing operational cost. Valparaíso's heritage authority, working with UNESCO on its listed historic quarter, has documented the problem but not yet resolved a procurement pathway for deduplication tooling.

Bendigo's advantage is less about technology than about scale and culture. With around 100,000 residents, the city's institutions are large enough to have proper digitisation programs but small enough that a coordinator can know the collection personally. That human layer — archivists who can review a flagged pair of images and make a judgment call — is harder to maintain in a city of two million.

Storage costs are a real driver. Commercial cloud archival storage in Australia currently runs at roughly $25 to $40 per terabyte per month for institutional accounts, and photographic collections digitised at archival resolution generate terabytes quickly. Cutting duplicate holdings by even 20 percent compounds into meaningful savings over a five-year budget cycle — savings that, for a regional institution, can fund a part-time position or an outreach program.

For Bendigo residents or community groups thinking about donating photographic collections to local institutions, archivists recommend contacting the Bendigo Regional Archives Centre directly before transferring files. Bringing in material that has already been roughly sorted — duplicates removed, metadata attached where possible — reduces processing time significantly and improves the chance that donated images end up properly catalogued rather than sitting in a backlog queue.