Duplicate Image Replacement: What Officials, Experts and Key Figures Are Saying

Digital asset managers across Melbourne's public sector are under pressure to address a sprawling and expensive problem: duplicate images embedded in government records, cultural archives and planning databases are slowing systems, inflating storage costs and complicating public access to official documents. The question of who should set the standard — and who pays — is now splitting opinion across the sector.

The issue has sharpened over recent months as the Victorian government's broader push to digitise planning and infrastructure records has accelerated, driven by housing density reforms that have pushed councils to upload thousands of development applications, site photos and heritage assessments. Every rushed upload adds to a backlog of redundant files. Information management specialists working with local government say the scope of the problem has grown well beyond what most agencies anticipated when they began digitising paper records in earnest.

Why It Matters Now

The City of Melbourne and the Victorian Department of Transport and Planning both maintain large-scale digital repositories that draw on image libraries updated by multiple teams simultaneously. Without automated deduplication tools in place, the same photograph of a Carlton terrace or a Fishermans Bend development site can exist in dozens of slightly different file formats across a single database. Storage costs compound quickly. Industry benchmarks cited by the Australian Information Industry Association suggest that duplicate data — across all file types — can account for between 20 and 30 percent of enterprise storage consumption in organisations that lack active deduplication policies, though figures vary significantly by sector and system age.

At the State Library Victoria on La Trobe Street, curators have been working through a multi-year digitisation program that covers photographic collections dating to the 1850s. Librarians there have long dealt with the practical challenge of distinguishing authoritative master files from lower-resolution copies made for public access or inter-departmental sharing. The library's digital preservation team uses checksumming processes to flag identical files, but partial duplicates — cropped versions, colour-adjusted copies — require human review and remain a significant time drain.

RMIT University's School of Information and Communication, based on Swanston Street in the CBD, has been running postgraduate research into automated image fingerprinting as a solution. The approach uses perceptual hashing, a technique that generates a compact numerical signature from an image's visual content rather than its raw file data, allowing near-duplicate images to be flagged even when file names or metadata differ. Researchers there have argued in published work that local government agencies could reduce manual review time substantially by adopting open-source fingerprinting tools already in use by major international archives.

The Debate Over Who Sets the Rules

There is no single Victorian government standard for how agencies should handle duplicate images in public records. The Public Record Office Victoria, which sets records management policy for state government bodies, has guidelines covering digital preservation formats and metadata requirements, but specific deduplication methodology is largely left to individual agencies. That gap is where disagreement is loudest.

Some information governance professionals working in local government argue that centralised guidance is overdue, particularly as councils in Melbourne's inner north — Yarra, Darebin, Moreland — have merged or expanded their digital systems following amalgamation discussions and shared-services agreements. Others contend that prescriptive rules would not account for the vastly different system architectures agencies use, and that the real fix is procurement: writing deduplication capability into software contracts from the start rather than retrofitting old systems.

For institutions like the Australian Centre for the Moving Image on Federation Square, the calculus is slightly different. Their collections staff work with video and still image libraries that run into the hundreds of thousands of files, and the cost of getting deduplication wrong — accidentally deleting a master file rather than a copy — carries curatorial and legal consequences that pure government records agencies do not face in the same way.

Agencies that have not yet reviewed their digital image holdings are being advised by records management consultants to begin with a file audit scoped to their most actively updated repositories, rather than attempting a system-wide sweep. The recommendation is to pilot automated flagging tools on a single database before broader rollout — a sequenced approach that limits the risk of accidental data loss while building internal expertise.