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Re:717 Gigapixel Image of Rembrandt's Nightwatch by blacha on Monday January 24, 2022 @09:13PM (#30067027)
looks to be using open sea dragon [1] This is just a tiled map so any web mapping software would also work OpenLayers, Leaflet, Maplibre etc.

[1] https://openseadragon.github.io/

Re:717 Gigapixel Image of Rembrandt's Nightwatch by _joel on Tuesday January 25, 2022 @09:32AM (#30072148)
Interesting, I've used leaflet a lot in the past (love it!) for GIS but never thought about tiling a more generic image to it. Good call.