JPEG quality estimation: experiments with a modified ImageMagick heuristic

Bailey AKA the "I have no idea what I'm doing" dog . License unknown. In this post I explore some of the challenges I ran into while trying to estimate the quality level of JPEG images. By quality level I mean the percentage (1-100) that expresses the lossiness that was applied by the encoder at the last “save” operation. Here, a value of 1 results in very aggressive compression with a lot of…