JPEG Quality is our first plugin for WordPress which allows you to more finely tune the way WordPress
outputs JPEG files. For example you may want an image size for the background of your theme and you
don’t actually need it at the WordPress default of 82, this plugin will let you change it for just
that size class. WordPress by default only allows for you to override this setting with code, which is a little restrictive.

Available from the WordPress.org Plugin centre for free!

Covert art by @jfbrou