New in 1.6.7
★ Fix crash while converting some PNGs.

New in 1.6.6
★ Fix bug while scrambling some JPEGs (like from Huawei devices)
★ Remove even more JPEG (possible) metadata (all APPn from JPEG spec).

New in 1.6.5
★ Fix metadata leak bug. *If* scrambling failed with an IOException, the original image was shared.
★ (Re-)Add PNG metadata removal

