Melbourne Archivists and Designers Race to Fix a Hidden Digital Crisis: Duplicate Images

The State Library Victoria flagged the problem publicly at a sector briefing on Wednesday: its digitised collection, now exceeding 1.2 million catalogue records, contains a measurable proportion of duplicate image files that have compounded through successive scanning and upload cycles over the past decade. Librarians and archivists across the city say it is a problem that has quietly degraded search results, inflated storage costs, and undermined public trust in digital collections.

The issue is not unique to the Library. This week, multiple Melbourne-based institutions — including the City of Melbourne's own digital records unit on Little Collins Street and the Australian Centre for the Moving Image (ACMI) in Federation Square — confirmed they are either mid-audit or actively deploying new tools to detect and remove redundant image files from their public-facing systems. The convergence of these efforts in the same seven-day period reflects a broader reckoning that has been building since the federal government's digital preservation framework update in March 2026 placed new compliance expectations on institutions receiving public funding.

Why This Week Became a Turning Point

The catalyst was partly technical. A widely used open-source image deduplication library — perceptual hashing toolkit imagededup, maintained by the global developer community — pushed a significant version update in late June that improved detection accuracy for near-duplicate images, not just exact copies. For institutions sitting on backlogs of scanned photographs, newspapers, and art prints, that distinction matters enormously. A photograph of Swanston Street in 1952 scanned twice with slightly different brightness settings had previously been invisible to older detection tools. It no longer is.

ACMI, which manages one of the most heavily accessed moving-image archives in the southern hemisphere, began a duplicate-image audit across its digital collection in mid-June. Staff are using a combination of automated hash-matching and manual review, targeting the collection's photographic stills holdings first — estimated at several hundred thousand individual image files. The institution declined to put a specific figure on the number of duplicates found so far, but described the work as ongoing through the July-August period.

Private-sector pressure is arriving from a different direction. Melbourne's graphic design and creative agency community — concentrated heavily in Fitzroy, Collingwood, and the CBD's Docklands precinct — has been dealing with the commercial version of the same headache. Digital asset management is a growing line item for studios, and several Fitzroy-based agencies contacted this week described spending between $3,000 and $8,000 annually on storage for assets that include significant proportions of duplicated imagery inherited from client handovers. Tools like Bynder and Brandfolder, both of which have Australian sales operations, have reported increased inquiry volume from Melbourne clients in the second quarter of 2026, according to publicly available sales commentary from both companies.

The Practical Fallout — and What Comes Next

For everyday users searching public archives, duplicate images surface as confusing repeated results, erode confidence in catalogue accuracy, and in some cases push genuinely rare images further down search rankings. At the State Library Victoria on La Trobe Street, librarians say patron complaints about search quality have been a consistent thread in user feedback surveys conducted each quarter.

The good news is that tools are improving faster than the backlog is growing. Perceptual hashing — which compares images by their visual fingerprint rather than their file metadata — can now process thousands of images per minute on standard server hardware, dramatically reducing the manual workload. Several Victorian TAFE institutions, including RMIT's city campus on Swanston Street, are incorporating duplicate-detection workflows into their digital media and library studies curricula from Semester 2, 2026, recognising that graduates entering the sector will need to manage these problems from day one.

For individuals dealing with duplicate images in personal or professional collections, archivists recommend running a free perceptual hashing tool before any major cloud migration rather than after — a lesson that institutions are learning the expensive way. The City of Melbourne's digital records unit expects to publish guidance for smaller councils and community organisations by the end of July, following the completion of its own internal audit. That document, when it arrives, will be the most concrete local policy output to emerge from this week's broader reckoning.