A heuristic to decide for a given resolution level whether the source pixels should be taken from the original image or read from a previously written resolution level in the hdf5 file.
Propose number of mipmap levels, as well subsampling factors and chunk size for each level.
Create a hdf5 files containing image data from all views and all timepoints in a chunked, mipmaped representation.
Simple heuristic: use loopback image loader if saving 8 times or more on number of pixel access with respect to the original image.
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