how is HDR different than simply adding more bits for finer steps between the same existing colors?
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From a photography perspective, which is the root of HDR, it’s about capturing color/detail where the sensor would’ve otherwise only seen black or white. Without getting too bogged down in details, the camera sensor has a ‘range’ of brightness where it perceives color and detail. Anything higher than that shows pure white, anything lower than that, pure black. The job of the sensor is to pick the right range so that the maximum color/detail is displayed and the least color information is clipped (pure black/white.) What HDR does is recover the color and detail in those clipped areas. Before HDR tech, we would achieve this by ‘bracketing’ exposures – set camera on tripod and take 1 picture using the correct exposure, then take multiple other frames that are over and underexposed to capture the maximum information, then fill in the clipped areas in the first frame with the under/over exposed information (detail/color) from the other frames in Photoshop.
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