I observed following phenomena today: in my room with some lightings, there is a stuff toy placed in front of a wall. The ambient lighting doesn't cause any shadow on the wall currently.
Scene 1: Now, I switched ON a torch and pointed it to a stuff toy which was kept in front of a wall and a shadow appears on the wall.
Scene 2: I increased the light intensity of the torch falling on the toy and observed that the shadow on the wall has become darker. However, I didn't observe this phenomena when I switched of all the lights of my room and repeated the experiment.
I captured Scene 1 and Scene 2 using a camera. I compared these two images using a program. The shadows are of different intensity in the two images as it was observable by the naked eye.
A practical example: Sun spots appear black, but they aren't actually black
It seems camera also adapts and works similar to our eyes. Can somebody formally explain this to me? I am more interested in the image formation by the camera in this case, not the human eye and biology related things.