Being Undigital: The Wyckoff principle
Combining the two images gives enhanced shadow detail, AND enhanced highlights.

We now see clearly the people outside in the bright sunlight, and we also see much more of the interiour detail of the building
I call this the "Wyckoff principle" in honor of Charles Wyckoff, inventor of extended dynamic range film.

Contact info: Professor Steve Mann, University of Toronto, Department of Electrical Engineering, 10 King's College Road, Toronto, Ontario, M5S 3G4