Why do some people have ‘red eyes’ in their photographs?

Answer 1

red eye
The appearance of red eyes on people and animals when pictures are taken with flash. In dimly lit environments, the eye's iris opens to let in more light. The flash light reflects back from the retina, which is full of blood vessels; hence, the red look.

Pre-Flash
Some cameras have an option that produces a flash of light just ahead of the actual flash. The first flash causes the iris to close, eliminating some of the reflection.

Automatic and Manual Removal
All photo editing programs have a removal function that eliminates the red. It requires that the user highlight the area around the eyes and either select a fixed removal function or adjust the amount of reduction. Some programs offer options for replacing the red with a color, which is helpful for pictures where the eyes are an important focal point.

The red can always be removed in an image editor by carefully replacing the red with the correct eye color. Although this takes a fair amount of practice to do it well, the results are often the best.




Red Eye Removal
In Nabocorp's excellent cam2pc photo editor, red eye removal is accomplished by sliding a lever to the desired result using the adjustment in the dialog box at the bottom left.

Answer 2

The red-eye effect in photography is the common appearance of red eyes on photographs taken with a photographic flash when the flash is too close to the lens (as with most compact cameras).

The light of the flash occurs too fast for the iris of the eye to close the pupil. The flash light is focused by the lens of the eye onto the blood-rich retina at the back of the eye and the image of the illuminated retina is again focused by the lens of the eye back to the camera resulting in a red appearance of the eye on the photo. (This principle is used in the ophthalmoscope, a device designed to examine the retina.)

The effect is generally more pronounced in people with grey or blue eyes and in children. This is because pale irises have less melanin in them and so allow more light to pass through to the retina. Children, despite superficial appearances, do not have larger pupils but their pupils are more reactive to light and are able to open to the fullest extent in low light conditions. Many adults have lost the ability to fully open their pupils except through the use of drugs.

In many species the tapetum lucidum, a light-reflecting layer behind the retina that improves night vision, intensifies this effect. This leads to variations in the colour of the reflected light from species to species. Cats, for example, display blue, yellow, pink, or green eyes in flash photographs.

Answer 3

The red color comes from light that reflects off of the retinas in our eyes. In many animals, including dogs, cats and deer, the retina has a special reflective layer called the tapetum lucidum that acts almost like a mirror at the backs of their eyes. If you shine a flashlight or headlights into their eyes at night, their eyes shine back with bright, white light.

Humans don't have this tapetum lucidum layer in their retinas. If you shine a flashlight in a person's eyes at night, you don't see any sort of reflection. The flash on a camera is bright enough, however, to cause a reflection off of the retina -- what you see is the red color from the blood vessels nourishing the eye.

Answer 4

It's usually blue eyes that go more red too. I started taking photos only outside until I could remove the red eyes with my camera program

Answer 5

Redeye happens while the flash is basically too close to to the axis of the lens. with the aid of fact of this adventure photographers (and wedding ceremony) use an exterior flash which sits lots further far off from the lens axis. some cameras have a function referred to as "redeye alleviation" and different customer photograph courses like Photoshop factors (below $one hundred) have vehicle redeye correction.

Answer 6

The red eyes are caused by the flash being to close to the lens. It can be taken out by photography computer programs.

Answer 7

The light travels through their pupils, through the lens, and reflects off of the back of their eyes, called the retina. The camera catches this reflection.

Answer 8

light reflecting off the pupil causes red eye usually its people with brown eyes that this happens to.

Answer 9

light refraction causes red eye

Answer 10

Some people are just part demon, I wouldn't worry about it.