Exposure Merger (from AnaBuilder)

From AnaBuilder:

AnaBuilder is a freeware intended to build stereo photographs. It offers an Exposure Merger function that can be used with non-stereo photographs, without taking into account the original stereo goal of the software. It takes an overexposed photograph and a subexposed photograph, and merge them together in a tunable way to build a new photograph taking only the well exposed parts of each original.

It is also possible to produce 2 artificial exposures with a single photograph, using a gamma filter, and then to merge them together exactly like if it where 2 original differently exposed photographs.