“In photography and optics, vignetting refers to a reduction in image brightness in the image periphery compared to the image center.” From Wikipedia, the free encyclopedia.

The word vignetting is also used to indicate an unintended darkening of the image corners in a photographic image. It is a common problem due to the use of improper attachments to the camera lens.

Vignetting Reducer is a simple tool that can help you reduce or remove the effects of vignetting from a photograph. This program uses a process that involves the taking of a second picture using a bright background with the same lens, filters and hood that caused the initial vignetting effect. You can then load the second image as a mask and further adjust the effect and brightness until the vignetting effect is reduced or removed.

Vignetting Reducer is a freeware, you can click here to download.