Digital cameras can get info out of dark shadows so underexpose them. Take then into Photoshop Elements and bring out the hidden details.
If you want to really learn about your ancestors, digitally photograph (or scan) their old photographs. Take them into Photoshop Elements and bring out the details in the dark areas.
You will see old advertisements pop out on the sides of buildings or the details on fabric or hidden plants and on and on. I had no idea we could learn about our past from the dark shadows.
What do you mean by underexposing digital photos? When I upload digital photos to winkflash.com (12 cents/print and 99 cent shipping for any size order) if a picture is too dark I just lighten it in the edit mode using the brighten feature as many times as necessary. Is Photoshop Elements doing basically the same thing?