Red-eye is the term used to describe the reddened pupils of a subject’s eyes that sometimes occurs when photographing people or pets with an electronic flash. This effect often occurs when the pupil of the eye is dilated, usually in a low-light environment. The red color appears as a result of the light from the flash striking the rear portion of the eye and illuminating the blood vessels. Red-eye can often be avoided by placing the flash farther than 6 frThe reason red-eye is most common with compact digital cameras is because the flashtube is often adjacent to the lens, thereby causing light to enter a subject’s pupil head-on. A common pre-capture cure for red-eye is to bounce the flash onto an adjacent wall or ceiling, which softens the light and eliminates any red-eye effects.bhphotovideo
An effect caused by an electronic flash reflecting off the retina at the back of the eye making it look red. Compact cameras with the flash located close to the lens suffer the worst from this problem. Professional photographers use a bracket to hold an external flash unit above and off to the side of the lens to eliminate red-eye. It can also be easily reduced using most post-editing software.
The phenomenon in which the center portions of a subject s eyes appear as red spots in flash pictures.
A method of reducing or eliminating red-eye from flash photographs by using a short burst of light, or pre-flash, to momentarily stop-down the pupils of the subject’s eyes prior to the actual flash exposure. Some cameras have a built-in pre-flash that fires several times to coax the pupils into contracting, before making the final flash and image capture. Red-eye can also be eliminated electronically after the fact in many photo-editing programs. Many digital cameras contain software applications that electronically eliminate red-eye in-camera, as well.
Nikon Speedlight mode. Available with cameras having red-eye reduction with slow-sync.
A special flash mode whereby a pre flash or a series of low powered flashes are emitted before the main flash goes off. This causes the iris of the eye to contract meaning less light gets in the eye, therefore reducing red eye.