Looks easy. Yet you need to write the JPG to a temp file first since applescript does not seem to be able to parse JPEG without seek(), hence no piping / stream

Looks easy. Yet you need to write the JPG to a temp file first since applescript does not seem to be able to parse JPEG without seek(), hence no piping / streaming possible. [1] https://stackoverflow.com/a/30578507/5094001