Photography
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A flash is a device used in photography producing a flash of artificial light (typically 1/1000 to 1/200 of a second) at a color temperature of about 5500 K to help illuminate a scene. A major purpose of a flash is to illuminate a dark scene. Other uses are capturing quickly moving objects or changing the quality of light.
Flash (photography)
Dynamic range , abbreviated DR or DNR , [ 1 ] is the ratio between the largest and smallest possible values of a changeable quantity, such as in signals like sound and light . It is measured as a ratio, or as a base-10 ( decibel ) or base-2 (doublings, bits or stops ) logarithmic value.
Dynamic range
Glare (vision)
Glare is difficulty seeing in the presence of bright light such as direct or reflected sunlight or artificial light such as car headlamps at night.