Melbourne Councils and Archives Push to Fix Duplicate Image Problem Clogging Digital Collections

A quiet but significant cleanup is underway across Melbourne's public institutions this week, as libraries, local councils and cultural archives grapple with a years-long accumulation of duplicate digital images jamming their collections management systems. The problem — tens of thousands of near-identical scanned photographs, maps and heritage documents stored under different file names — has grown severe enough that several organisations moved this week to bring in specialist remediation tools and dedicated staff to sort through the backlog.

The issue matters now because Victoria's state government has made digitisation of local heritage records a funding priority, with the Public Record Office Victoria allocating resources toward community archive grants in the 2025–26 budget cycle. When duplicate images go unaddressed, they inflate storage costs, confuse public search results and, in some cases, cause institutions to serve incorrect images to researchers who believe they are viewing unique primary sources.

Who Is Doing What, and Where

The City of Melbourne's library services team, operating out of the Melbourne Town Hall precinct on Swanston Street, began a structured audit of its digital photograph holdings on Monday. The collection — which includes tens of thousands of images documenting the CBD's development from the 1860s onward — had accumulated significant duplication through successive rounds of bulk scanning, according to internal communications circulated to collection staff and reviewed by The Daily Melbourne.

Across town, the Darebin Libraries network, which serves suburbs including Northcote, Preston and Reservoir, launched a pilot program this week using open-source perceptual hashing software to flag visually identical or near-identical image files across its local history archive. The tool compares pixel patterns rather than file names, catching duplicates that standard metadata checks miss entirely. Darebin's local history collection holds photographs dating to the late 19th century, many digitised under separate grant-funded projects that used inconsistent naming conventions.

The State Library of Victoria on La Trobe Street has been dealing with a version of the same problem at larger scale. Its digital collections team has been running deduplication workflows since late 2025 as part of a broader infrastructure upgrade. The library declined to provide current figures on duplicates identified, but staff familiar with the process have described it as an ongoing rather than one-time task.

Why the Problem Compounds So Quickly

Digital duplication in archival collections typically snowballs when institutions scan the same physical items across multiple projects, receive donated image sets that overlap with existing holdings, or migrate files between systems without reconciling metadata. A single heritage photograph of, say, Brunswick Street in Fitzroy circa 1920 can end up stored under four or five different accession numbers, each with slightly different cropping or contrast adjustments applied by different scanning operators.

Storage costs are real and measurable. Cloud archival storage for cultural institutions in Australia has risen sharply, with some providers now pricing cold-storage tiers at around $25 to $30 per terabyte per month depending on contract terms — figures that add up fast when an organisation is unknowingly maintaining three or four copies of the same large TIFF file. For smaller councils, a duplicated image problem discovered late can represent thousands of dollars in unnecessary annual expenditure.

The Australian Library and Information Association flagged duplicate digital content as a systemic collection management challenge in guidance material published in 2024, noting that the problem is particularly acute for institutions that have run multiple digitisation grant rounds without centralised oversight of what was previously scanned.

For organisations and individuals trying to stay ahead of the issue, collection managers recommend three practical steps: conduct a hash-based comparison of all image files before any new digitisation project begins, establish a single canonical file-naming standard enforced across all grant-funded scanning work, and schedule a rolling annual audit rather than waiting for the problem to become critical. Several tools — including open-source options compatible with standard Windows and Mac environments — can run initial scans of collections numbering in the hundreds of thousands within a matter of hours. Melbourne institutions planning fresh digitisation rounds ahead of any 2026–27 grant applications would do well to complete their audits before lodging proposals. Funders are increasingly asking applicants to demonstrate existing collection hygiene before approving new scanning money.