How Paris's Public Image Archives Fell Into the Duplicate-Photo Trap — and What's Being Done About It

Paris's municipal image archive now holds an estimated 2.4 million photographs across several overlapping databases — a figure that senior archivists at the Bibliothèque historique de la Ville de Paris have flagged internally as unsustainable. A significant share of those files are duplicates: the same shot of the Pont de Bir-Hakeim or the Marché d'Aligre indexed under three different file names, tagged inconsistently, and costing storage money nobody budgeted for.

The problem did not arrive overnight. It is the product of at least a decade of decisions — some deliberate, most not — that layered new digital systems on top of old ones without ever retiring the originals. Understanding how Paris got here matters now because the Grand Paris métropole is midway through a 2025–2028 digital governance review, and the question of what to do with tens of thousands of redundant image assets sits near the top of the agenda.

The Paper Trail: Olympics, Regeneration and a Rush to Publish

The inflection point most archivists point to is 2023 and 2024. In the run-up to the Paris 2024 Summer Olympics, the Direction de la Communication de la Ville de Paris dramatically accelerated its output of promotional photography. Photographers contracted to document Seine-Saint-Denis venue construction, the transformation of the Champs-Élysées for the road cycling events, and the Canal Saint-Martin public screenings were uploading images to at least three separate platforms simultaneously: the city's internal DAM (digital asset management) system, a press agency relay, and a dedicated Paris 2024 legacy portal that was stood up quickly and integrated poorly with existing infrastructure.

Each upload event created duplicates. A single image of scaffolding coming down at the Stade de France might exist as a RAW file, a compressed JPEG for press use, a watermarked thumbnail for the legacy portal, and a cropped square version pushed to the city's social media cache. None of those four versions pointed to the others. Multiply that across roughly 18 months of intensive Olympic documentation and the scale of the problem becomes concrete.

The Seine urban regeneration programme compounded things further. Projects along the Left Bank between the Bibliothèque François-Mitterrand and the Pont d'Iéna generated their own documentation streams, fed by urban planning agencies, private developers required to supply images under permis de construire conditions, and journalists given pooled access. Those images entered the public record through different doors and have never been consolidated.

Audits, Costs and the Path Forward

The Agence Parisienne du Climat and the Atelier Parisien d'Urbanisme — two of the bodies whose communications teams contributed heavily to the duplication — are both named in a working document circulated to city councillors in May 2026 that calls for a unified deduplication protocol by the first quarter of 2027. The document, reviewed by this reporter, does not assign blame but is direct about the financial consequences: cloud storage costs for the municipal image estate rose by roughly 34 percent between 2022 and 2025, a period when the actual volume of genuinely new images grew by far less.

The practical mechanics of deduplication are not glamorous. Perceptual hashing — software that compares images mathematically rather than by file name — can flag near-identical photographs even when they have been cropped or recompressed. The Médiathèque de l'Architecture et du Patrimoine, based in Charenton-le-Pont just south-east of the périphérique, has used a version of this approach since 2019 and is now being consulted by the city as a model. The process is not instant: a collection of two million files can take weeks to process, and human review is still required before anything is deleted from a public record.

For now, the most immediate step is a freeze on adding new images to the legacy Olympic portal while the audit runs. Photographers and communications officers working on projects tied to the Grand Paris Express — including documentation of the new Line 15 South stations opening in late 2026 — have been asked to upload exclusively to the unified DAM system, with mandatory metadata fields designed to catch duplicates before they are committed to long-term storage. Whether that discipline holds under deadline pressure is the question the archivists are watching most carefully.