View Window - Image | Process | Auto Color Balance                    Shift+A

Main Window - Image | Batch Process - Batch Steps - Add | Process | Auto Color Balance

 

 

Attempts to color balance the image, based on an average of all pixels or an average of the pixels in the current selection. If you make a selection, select an area that should appear (on average) gray rather than colored.

 

Thanks to Jim "Andy" Anderson for the algorithm!