In corona 13 there is an option for auto adjustment of brightness and white balance. It works just fine in 3ds max, but in standalone image editor this option is not available.
Some time ago in vray similar thing was shown as a tool for rendering animations. We render animations on multiple machines and get a bunch of CXRs. So we get frames using corona image editor.
Marking this as Accepted as it's already on the roadmap for Corona 14 as part of bringing the CIE up to date with the VFB 2 (https://trello.com/c/yXqkZysy/325-rework-corona-image-editor-to-match-new-vfb-2-functionality-and-look ), which covers all the new functionality in the VFB 2 and not just this specifically.