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Project idea: a subsampler for EXR image files, so I can render high resolution source keyframes subsample them all for more comfortable interactive video sequencing, then swap back to the high resolution directory for the final render.

There is an exrmaketiled tool, but I don't know if reading tiled mipmapped EXR will be as efficient. Almost certainly much more complicated. To be investigated...

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`exrsubsample` implemented in ~30mins, mostly by copy/paste of `exrtactile`:
code.mathr.co.uk/exrtact/commi
(it crashed at my first attempt, had left some factor multipliers in the wrong places, but it's all ok now.)

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