random thought
are there any image formats that support non-uniform pixel densities, e.g. if you were to have a camera sensor with a fovea
we assume you can do this with SVG, of course, but probably not very efficiently
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@diodelass ROOT would support this. Eg, one might save a TGraph. The result is effectively a gzipped binary list of (x,y,value) tuples. ROOT's a big software dependency to take on. If you are working in Python then "uproot" is a smaller, compatible package. Big caveat that ROOT's format popularity is fairly minimal outside particle/nuclear physics world.
