Why can our eyes handle a bright window and a dark room better than a camera?
Asked 10/1/2012
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In a dark room looking out a bright window, I can still perceive details both inside the room and outside. A camera usually forces me to expose for either the interior or the exterior, not both at once. Why does human vision seem to handle much more dynamic range than a camera? Is this mainly a limitation of digital cameras, or does the same issue apply to film as well?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
13y ago
2 Answers
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The reason you can see such a large dynamic range isn't that the eye, as an optical device, can actually capture such a range - the reason is that your brain can combine information from lots and lots of "exposures" from the eyes and create an HDR panorama of the scene in front of you.
The eye is pretty poor from an image quality standpoint but it has a very high "frame rate" and can change sensitivity, direction and focus very quickly.
The brain takes all those images from the eye and create the image you think you see - this includes details from images at different sensitivity and even details that are completely made up based on what you expected to see. (This is one reason why there are optical illusions - the brain can be fooled into "seeing" things that aren't really there).
So, you can see with your camera just like with your eye, just take lots of exposures at different settings then load everything into Photoshop, create an HDR panorama and use "content aware fill" to fill the gaps.
By the way, why cameras "should" be able to capture that range but monitors shouldn't be able to reproduce it? If technology that doesn't exist should exist then monitors should be able to reproduce anything we can see (and I should be able to take a vacation at a low gravity hotel on the moon)
Originally by user2481. Source · Licensed CC BY-SA 4.0
user2481
13y ago
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What you perceive is not from a single “exposure” like a camera frame. Human vision is a system of eyes plus brain: your eyes rapidly change sensitivity, focus, and direction, and your brain combines many small glimpses over time into a single mental image. It also adapts locally and fills in missing information based on context, which is why vision can be fooled by optical illusions.
So the difference is not just sensor dynamic range. A lot of the advantage comes from continuous auto-exposure, rapid eye movements, adaptation, and real-time “HDR-like” processing by the brain. The eye itself is not simply a perfect high-dynamic-range camera.
Cameras, whether digital or film, generally record a single exposure at a time, so high-contrast scenes often exceed what one frame can hold. To imitate what we perceive, photographers use techniques like HDR blending, exposure bracketing, graduated filters, or lighting the darker area.
So yes, this is a limitation of both film and digital capture compared with the full human visual system, not just a digital-only problem.
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