on 2013-12-30 17:59 Bruce Walker wrote
By the way, the lowly JPEG that we raw image users most often throw away actually has an unintended useful purpose. If you have taken a few essentially identical images of a scene, grab the JPEGs and compare their image file sizes. The one with the largest size will be from the sharpest image in most cases. The sharper the image the more fine detail it contains and therefore the less compressible it is.
this measure has value if you understand its limits; a simple counterexample is a subject in front of a foliage background - if your AF misses the subject and focuses on the foliage, the JPEG will have lots of _undesired_ fine detail and thus it will be less compressible
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