kosher jpgs

I noticed that winzip sometimes issues a warning message that it can't
compress a jpg with its proprietary jpg compression method. This
suggests that some of my jpgs are not completely kosher.

This lead be to wonder if there is some java code to detect if jpgs
are completely kosher, ditto pngs, and possibly correct them if not.

Alternatively, perhaps some utility will do this.

I also wondered what it might be about the images that Winzip does not
like.
--
Roedy Green Canadian Mind Products
http://mindprod.com
A vote for McCain is fearful clinging to McSame.
A vote for Obama is a shot at Obamalot.
.