Hong Kong's Duplicate Image Problem: How the City Stacks Up Against Singapore and London

Hong Kong's major public institutions are sitting on terabytes of redundant image data, and the systems meant to catch duplicates before they clog archives, slow platforms and mislead the public are only now catching up with the scale of the problem. A review of procurement records and technology tenders filed with the Government Logistics Department in the first half of 2026 shows at least four separate agencies — including the Hong Kong Public Libraries network and the Hong Kong Trade Development Council — have issued or renewed contracts for digital asset management systems that include duplicate-detection modules.

The timing matters. The HKTDC alone manages an image library of well over 200,000 assets used across its trade fair promotions, online platforms and the annual Hong Kong Book Fair, held every July at the Hong Kong Convention and Exhibition Centre in Wan Chai. With AI image generation tools now producing near-identical visuals at scale, the organisation faces a version of the same challenge confronting archivists from the British Library in London to the National Library Board in Singapore: how do you stop the same image — or a near-copy — from being catalogued, licensed and published dozens of times?

What Hong Kong Is Doing — And Where It Falls Short

Singapore's National Library Board adopted a perceptual hashing framework for its digital collections back in 2023, embedding automated deduplication directly into its ingest pipeline so that near-duplicate images are flagged before they enter the main archive. The result, according to the NLB's publicly published annual report for 2024-25, was a reduction in storage redundancy across its NewspaperSG and PictureSG collections. Hong Kong's equivalent institution, the Hong Kong Central Library on Tin Lok Lane in Causeway Bay, has no equivalent publicly documented standard as of mid-2026.

London's approach has been fragmented but aggressive at the commercial tier. The UK's Press Association and Getty Images both deployed perceptual hash-based deduplication across their wire services by late 2024, meaning that when a photographer submits a burst of 40 near-identical frames from a single event, the system surfaces only the sharpest unique selections for editorial use. Hong Kong-based photo agency VCG Hong Kong, which supplies imagery to local newspapers including Chinese-language outlets in Mong Kok and Kwun Tong print centres, has not publicly disclosed comparable automation protocols.

The practical cost of inaction is not trivial. Cloud storage pricing in Hong Kong's Tier 1 data centres — concentrated in Tseung Kwan O and Tsuen Wan — runs at roughly HK$0.08 to HK$0.12 per gigabyte per month for warm storage, according to publicly available rate cards from local providers. For an archive carrying even 10 percent unnecessary duplication across a 500-terabyte collection, the monthly overhead can exceed HK$400,000. Multiply that across government bureaus, universities and media organisations, and the systemic inefficiency is considerable.

The Deeper Risk: Misinformation and Licensing Confusion

Duplicate images are not just a storage headache. When the same photograph exists in a database under multiple metadata entries — different captions, different dates, different rights statuses — it becomes a vector for misinformation. A Wan Chai protest image catalogued under a 2019 date and again, stripped of metadata, under a 2025 date, tells two entirely different editorial stories. The risk of that kind of metadata drift is precisely why the Reuters Institute for the Study of Journalism at Oxford flagged image provenance as one of its top editorial integrity concerns in its 2025 Digital News Report.

City University of Hong Kong's School of Creative Media, based on Tat Chee Avenue in Kowloon Tong, has been developing a provenance-tagging curriculum for its media students since 2024, integrating C2PA — the Coalition for Content Provenance and Authenticity — standards into coursework. That kind of education pipeline takes years to produce industry-wide change.

For Hong Kong organisations that want to act now rather than wait for a government-wide standard, the practical path is clear: adopt perceptual hashing tools such as pHash or FPCALC at the point of content ingest, establish a minimum metadata schema aligned with IPTC standards, and audit existing libraries for redundancy before the July-to-September conference season floods archives with fresh event photography. The HKTDC's own upcoming book fair, opening July 16, will generate thousands of new images. Whether those images enter a clean system or an already cluttered one is a choice institutions still have time to make.