jpeg-recompress image.jpg compressed.jpg
jpeg-compare Compare two JPEG photos to judge how similar they are.
jpeg-hash Create a hash of an image that can be used to compare it to other images quickly.
Perceptual #image #compression at Flickr | code.flickr.com
Flickr had historically aimed for high quality at the expense of larger files, but in late 2014 we implemented a method to both maintain image quality and decrease the byte-size of the images we serve to users. Tags: #webperf #UX image #jpeg compression #clevermarks
There’s No DRM in JPEG—Let’s Keep It That Way | Electronic Frontier Foundation
We encourage the JPEG committee to continue work on an open standards based Public Key Infrastructure (PKI) architecture for JPEG images that could meet some of the legitimate use cases for improved privacy and security, in an open, backwards-compatible way. However, we warn against any attempt to use the file format itself to enforce the privacy or security restrictions that its metadata describes, by locking up the image or limiting the operations that can be performed on it.