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answered 2018-06-21 23:56:22 -0600
cv.imwrite('cropped_tree_half.exr', img, [cv.IMWRITE_EXR_TYPE, cv.IMWRITE_EXR_TYPE_HALF]) solved the problem of writing exr with half
cv.imwrite('cropped_tree_half.exr', img, [cv.IMWRITE_EXR_TYPE, cv.IMWRITE_EXR_TYPE_HALF])