Adobe DNG Flat Field is a very useful Lightroom plug-in designed to help you remove the effects of an optical phenomenon called shading (or "lens cast").
Usually shading is fixed using a calibration image and Adobe DNG Flat Field is able to analyze the calibration shot in order to remove the light falloff and color cast from the corresponding real photo.
The Adobe DNG Flat Field plug-in installs through its built in mechanism and will add to the Lightroom Library two menu options: Apply interleaved correction and Apply external correction. Both features include batch processing capabilities.
· Lightroom 4 or later