How Melbourne's Public Art Archive Fell Into a Duplicate Image Crisis — and What It Took to Get Here

Melbourne's sprawling digital archive of public artworks, murals and heritage photography now holds more than 340,000 image files — and for the better part of three years, a significant portion of those files existed in duplicate, triplicate or worse. The problem didn't arrive overnight. It was built, slowly and bureaucratically, one scanning contract at a time.

The issue matters right now because Creative Victoria and the City of Melbourne are mid-way through a joint remediation project, funded under the 2024–25 Victorian Budget's cultural infrastructure allocation, that is supposed to produce a single, clean digital repository before the end of the 2026 calendar year. The stakes are practical as well as archival: the repository underpins grant applications, exhibition loans, public planning submissions and school curriculum resources used by institutions from the Koorie Heritage Trust in Wurundjeri Country to the Abbotsford Convent arts precinct in the inner north.

How the Duplication Problem Was Built

The roots go back to at least 2011, when the City of Melbourne commissioned its first large-scale digitisation of street art along Hosier Lane and AC/DC Lane in the CBD. That contract was handled by a private scanning firm and delivered images in a proprietary format. Three years later, when Arts Centre Melbourne partnered with the State Library Victoria on a separate digitisation push, different software, different file-naming conventions and different metadata standards were used. Neither project talked to the other.

Between 2016 and 2021 at least four additional scanning rounds were completed — covering Federation Square public artworks, the Docklands public art trail, the inner-north warehouse mural corridor along Smith Street in Collingwood, and a separate Yarra City Council heritage photography program focused on Fitzroy. Each round produced its own folder structure, its own resolution standards and, critically, its own version of images that had already been digitised before.

A 2023 audit commissioned by Creative Victoria found that roughly 22 per cent of records in the combined archive were functional duplicates — meaning the same physical artwork captured in files that were indistinguishable to a non-specialist but stored under different identifiers, in different systems, with conflicting provenance metadata. That audit, conducted by the University of Melbourne's School of Computing and Information Systems in partnership with the Public Record Office Victoria, was not publicly released but its findings were described in a Creative Victoria board paper tabled in March 2024.

The Remediation Effort and What Comes Next

The current replacement-and-consolidation program uses a perceptual hashing algorithm — a technique that compares visual fingerprints of images rather than file names or pixel-by-pixel matches — to flag probable duplicates for human review. The technology was piloted at the Ian Potter Centre: NGV Australia at Federation Square in late 2024 before being scaled to the broader archive. As of June this year, roughly 60,000 duplicate flags had been reviewed, with around 41,000 redundant files removed or merged.

The practical effect on end users has already been visible. Educators accessing the Victorian Curriculum and Assessment Authority's digital resource portal reported in feedback collected earlier this year that search results for Melbourne public art had, until recently, returned confusing clusters of near-identical images with no clear indication of which was the authoritative version. The consolidated records resolve that by linking each image to a single canonical entry with verified provenance.

For institutions that depend on the archive — among them the Koorie Heritage Trust at 295 King Street in the CBD and the Abbotsford Convent Foundation — the clean-up also matters for grant compliance. Federal and state arts funding bodies increasingly require applicants to cite verified digital catalogue references when claiming community engagement with public artworks. Duplicate or contradictory records created administrative friction that delayed at least some applications, according to the March 2024 board paper.

The remediation project is scheduled to reach full completion by December 2026, at which point the consolidated archive will be migrated to a new platform managed jointly by Creative Victoria and the Public Record Office Victoria. Institutions and researchers wanting early access to the cleaned catalogue can register interest through the State Library Victoria's digital collections portal, which has been accepting expressions of interest since May this year.