This is what I use to compress photos for upload to online galleries.

Somebody has asked me for this a long time ago. Well, I'm not sure if they still wants it, but here it is.

Requirements

For now, the program paths are hardcoded for my own use.

• bash
• mozjpeg (other cjpeg not tested)
• imagemagick (don't put untrusted images through this script)
• exiftool
• GNU parallel (I'm not sure if its startup message is even meaningful for a GPL licensed software...)
• dssim, compiled with USE_LIBJPEG=true