A small tool to recompress JPEG, PNG, and GIF images.
repng2jpeg is a single binary, which makes it readily available, and simple
for use in scripts, and other utilities. Some of the possibilities include

 - mass recompression of entire directory/ies
 - scripted via Perl, as an online utility
 - your-creative-usage-here...

WWW: https://BSDforge.COM/projects/graphics/repng2jpeg/