On Tue, Nov 28, 2017 at 2:14 AM, bartc <bc at freeuk.com> wrote: > JPEG uses lossy compression. The resulting recovered data is an > approximation of the original. Ah but it is a perfect representation of the JPEG stream. Any given compressed stream must always decode to the same output. The lossiness is on the ENcoding, not the DEcoding. ChrisA