lossless compression of still images - recommendations?

[Jonesy]

On Sun, 19 Feb 2017 13:26:48 -0500 (EST), Robert Heller wrote:
>

> If the OP wants truely lossless compression, he is not going to be 
> using JPEG.  JPEG is *lossy* compression.  He should be using PNG 
> instead.

Of course, you are correct.  I meant to go back and edit that --- then 
forgot.

But, my comment remains:  No two, seperately taken, identical images
should result in an identical bit stream, or large sub-sets of the bit
stream.  But, perhaps, this is the second time I've ever been wrong.  :-)

Jonesy