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I maintain this is bad and/or wrong but I'm not going to continue arguing the point, so will leave these tests here for my own future reference
Downsampling
The current behaviour is arguably unintuitive with respect to downsampling as demonstrated in the other 4 unit tests added. There is some discussion in qupath#25 about whether this behaviour should change. In my view, if retaining the current behaviour, we should warn users (either in code or documentation but ideally both) that they may be receiving rasterised images, and that they should be supplying coordinates based on the downsampled image, rather than the full-sized image that the labeled image server is created from.