Some photographs are extremely challenging to fix by means of post-processing. The worst ones may be those that are overexposed. Such a photograph will have a histogram skewed towards the higher intensities. Worse still are those with one part of the image that looks reasonable. As an example consider the image below, taken in the carpentry shop at Fort George (NY). The sunlight streaming in from the window has caused quite an over-exposure on the right side of the image.
It is *extremely* challenging to fix an image like this. It may be possible, given multiple images, or by somehow creating a “map” of the overexposed region, however this is a stretch.
Let’s face it, some images cannot be saved.