I want to estimate the quality of uploaded JPEG files by analyzing their Quantization Tables (DQTs).
Is there a way to do this with PIL? I already figured out the Image.quantization property, but without some quantization array ==> JPEG quality mapping I can't make assumptions on the quality. Exiftool provides an enormous amount of JPEG DQT checksums in this module: http://cpansearch.perl.org/src/EXIFTOOL/Image-ExifTool-7.82/lib/Image/ExifTool/JPEGDigest.pm I really like to build on that dataset, but this implies that I make my quantization hashing function compatible to the one of Exiftool and eventually need to access the raw DQT. Any hints on that? nice regards, Franz
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