Milan Moves Faster Than Paris and London on Duplicate Image Cleanup — But the Archive Problem Runs Deep

Milan's Pinacoteca di Brera logged more than 14,000 flagged duplicate image entries in its online catalogue last autumn — a number that curators have been working to reduce through a digitisation review launched in early 2026. The project, running alongside Italy's broader Piano Nazionale di Digitalizzazione del Patrimonio Culturale, puts the city ahead of several European counterparts in at least acknowledging the scale of the problem, even if the fix is far from finished.

The issue of duplicate imagery in institutional archives matters now for a specific reason: the Milan-Cortina 2026 Winter Olympics is driving an unprecedented spike in digital traffic to city tourism and cultural sites, with Comune di Milano estimating visitor-facing web platforms will handle roughly triple their normal load between October and March. Serving duplicate, low-resolution, or mislabelled images to international audiences — journalists, broadcasters, sponsoring brands — carries real reputational cost for a city that markets itself as a global capital of design and fashion.

What Milan Is Actually Doing

Two institutions are leading the charge. The Fondazione Prada, whose campus on Largo Isarco in the Ortomercato district has become one of the city's most digitally active cultural venues, completed an internal image deduplication audit in March 2026, using automated hash-matching tools across its archive of roughly 80,000 exhibition and collection photographs. The foundation has not published specific figures on how many duplicates were removed, but the audit was confirmed in its spring programming notes.

Further north, in the Porta Nuova district, the Triennale Milano announced in February that it was partnering with the Politecnico di Milano's design faculty to develop an open-source metadata tagging protocol specifically aimed at preventing future duplication across Italian design archives. The protocol, provisionally called DesignTag Italia, is due for a public pilot in September 2026. The Politecnico, with its campus on Via Ampère, brings serious technical weight to a problem that is more logistical than it is aesthetic.

The Comune di Milano's own digital infrastructure office has been applying deduplication standards to the city's public photo library — images used on official tourism and Olympic partner portals — since January, with a deadline of August 31 to complete the first full pass.

How Milan Compares to Paris, New York, and Tokyo

The comparison with peer cities is instructive, if not flattering to everyone. Paris's Réunion des Musées Nationaux, which manages image licensing for more than 35 national collections, has been running automated duplicate-detection since 2023, giving it a roughly two-year head start. The RMN's system flags near-duplicate images — same artwork, different scan or crop — rather than only exact copies, which is technically more demanding and catches a broader class of error.

New York's Metropolitan Museum of Art, which made roughly 490,000 open-access images available through its online collection, has published documentation showing ongoing deduplication as part of its collections data pipeline. Milan's institutions are working at smaller scale but with comparable methodological ambition.

Tokyo's Agency for Cultural Affairs rolled out a national-level image deduplication framework across 900 registered cultural properties in 2024, setting a standard that Italian officials have cited in internal discussions about the Piano Nazionale, according to documentation reviewed by The Daily Milan. Japan's approach is notable for being centrally mandated rather than institution-by-institution — the key structural difference from Italy, where each museum or foundation runs its own archive.

That fragmentation is Milan's real vulnerability. The Brera, the Castello Sforzesco collections, the Museo del Novecento on Piazza del Duomo, and the Fondazione Prada all maintain separate, incompatible systems. Until DesignTag Italia or a comparable standard is formally adopted and funded, deduplication will remain a series of individual cleanup campaigns rather than a city-wide solution.

For organisations planning to license or republish images from Milanese institutions ahead of the Olympics, the practical advice is straightforward: request metadata sheets alongside any image, confirm file checksums where provided, and check catalogue entries on each institution's own portal rather than aggregator databases, which are slower to reflect corrections. The Brera's online catalogue at pinacotecabrera.org was last updated in June 2026 and currently reflects the most recent round of deduplication work.