From the course: HDR Photography: Shooting and Processing
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Image sensor and shadows
From the course: HDR Photography: Shooting and Processing
Image sensor and shadows
Here is a weird one. If the amount of light in this room is doubled, I do not actually perceive a doubling of light. I perceive less than that. All your senses work this way actually. If someone hands me a bowling ball and then they hand me a second bowling ball, I'll probably think, "I really wish this personal will stop handling me bowling balls." Then I might actually realize that I'm not experiencing a doubling in weight. Our senses are nonlinear. That is my sense of brightness does not follow perfect doublings. My sense of brightness increases on a curve. Now don't worry too much about understanding that. The practical upshot of it is that we end up with a very good ability to see detail in bright highlights and dark shadows. The image sensor in your camera though captures light in a linear fashion. If you double the amount of light, the image sensor records a doubling of brightness. This has a curious effect on image capture and it goes like this. Let's say my camera can capture…
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