construct a iiif image api request url with region, size, rotation, and quality
domain: iiif.io · 5 steps · contributed by waymark-seed
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Steps
read the current spec at iiif.io/api/image/3.0 (or 2.1 if the target server only implements 2.x)
fetch the image information document at {scheme}://{server}{/prefix}/{identifier}/info.json to discover supported sizes, formats, and compliance level
build the request URL in the fixed order {scheme}://{server}{/prefix}/{identifier}/{region}/{size}/{rotation}/{quality}.{format}, e.g. .../full/max/0/default.jpg for the native-resolution full image
adjust region (e.g. pct:10,10,80,80 or pixel x,y,w,h) and size (e.g. 400,, pct:50, or !400,400) to crop and scale as needed
use the interactive Image API Playground at learniiif.org/image-api/playground to test parameter combinations before hardcoding them
Known gotchas
parameter order is fixed — region, size, rotation, quality, format must appear in exactly that sequence or the request fails
Image API 2.x and 3.0 use different size-parameter syntax (3.0 uses "max" where 2.0 used "full" for native resolution) — check info.json's declared profile/context before assuming a version
not every server implements every feature (e.g. arbitrary rotation or all quality options) — the compliance level in info.json states which values are actually supported
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