Barcelona's Digital Archive Crisis: The Key Decisions Ahead on Duplicate Image Replacement

Barcelona's municipal archive system is sitting on a problem it can no longer ignore. Across the Arxiu Municipal de Barcelona and the photographic holdings of institutions including the Centre de Cultura Contemporània de Barcelona on Carrer de Montalegre, duplicate digital images — the product of years of overlapping scanning campaigns, donated collections, and inconsistently managed metadata — now account for a significant portion of publicly accessible holdings. The question is no longer whether to act, but how, and who pays for it.

The timing matters for reasons beyond tidiness. Mayor Jaume Collboni's administration has committed to expanding Barcelona's creative and innovation economy, positioning the city alongside Lisbon and Amsterdam as a southern European digital hub. A fragmented, redundant public image archive undercuts that ambition directly. Cultural institutions competing for European funding under the EU's Horizon Europe framework — which in its 2025 work programme prioritised digital heritage infrastructure — cannot credibly claim readiness if their core collections remain in disorder.

What the Duplication Problem Actually Looks Like

The issue is structural, not accidental. Barcelona's digitisation effort accelerated after 2017, when several Catalan institutions fast-tracked archival projects partly in response to political uncertainty following the independence referendum. That speed came with costs. Scanning was contracted in waves, sometimes by neighbourhood library branches operating under the Biblioteques de Barcelona network, sometimes centrally, and sometimes by private foundations with their own naming conventions. The result: a single photograph of, say, the construction of the Torre Agbar — now the Torre Glòries — in the Poblenou district might exist in three or four versions under different file names, inconsistent date tags, and conflicting copyright attributions.

No official figure has been published for the total volume of duplicates across the full municipal system. However, archivists working in comparable European city collections — Lisbon's Arquivo Municipal and the Amsterdam City Archives — have reported that aggressive digitisation phases typically produce duplication rates of between 15 and 30 percent in raw image files before deduplication protocols are applied. Applied against Barcelona's publicly stated holding of more than 4 million digital images in the municipal archive as of its last annual report, even a conservative 15 percent rate would mean upward of 600,000 files requiring review.

The cost of doing nothing is measurable. Storage costs for unmanaged large-format image files are not trivial, and more practically, duplicate entries degrade search results for researchers, journalists, and the growing number of app developers who access the archive's open-data portal through the Barcelona Dades Obertes platform.

The Decisions That Will Define the Next Phase

Three choices are now unavoidable. First, who leads the deduplication — a centralised municipal directorate or the individual institutions? The Arxiu Municipal sits under the Gerència de Recursos i Organització, but the CCCB and the Museu d'Història de Barcelona on Plaça del Rei maintain enough institutional autonomy that a top-down mandate will require negotiation, not just a circular from City Hall.

Second, which technical standard governs the replacement process? The International Council on Archives published updated guidance in 2024 on perceptual hashing and AI-assisted duplicate detection, but adoption requires budget for software licensing and staff retraining. A request for EU co-financing under the Digital Europe Programme, whose 2025–2027 cycle includes cultural data infrastructure grants, is one route the city has not yet formally pursued, according to publicly available grant recipient lists.

Third — and most politically sensitive — is what happens to duplicates that carry competing copyright claims. Some donated collections include images where the original photographer's estate and the donating institution both assert rights. Replacing or suppressing a duplicate without resolving that legal question first could expose the city to challenge.

The Collboni administration has until the end of 2026 to submit its next four-year cultural infrastructure plan to the city council. That document is the natural vehicle for a formal deduplication policy. Archivists and digital heritage advocates will be watching the autumn budget round closely — specifically whether the Departament de Cultura i Memòria receives the additional allocation needed to make any of this more than a paper commitment.