Adaptation (eye)
Videos
In visual physiology, adaptation is the ability of the retina of the eye to adjust to various levels of light. Natural night vision, or scotopic vision, is the ability to see under low-light condition
The pupillary light reflex is a quick but minor mechanism of adaptation
Reflection of camera flash from tapetum lucidum
Extreme red light used on a ship's bridge at night to aid dark adaptation of the crew's eyes
Astronomer preserves night vision
Contrast (vision)
Videos
Contrast is the difference in luminance or color that makes an object distinguishable from a background. Human vision is more sensitive to relative differences than to absolute luminance, so perceived
Six renditions of a rocky shore photo with incremental contrast levels, clockwise from bottom left
The contrast in the left half of the image is lower than that in the right half.
A photograph of a leaf with several colors—the bottom image has an 11% saturation boost and around 10% increase in contrast.
Tour Eiffel Notre Dame