Red eye

RO: Red eye reduction EN: Red eye

Arta

Red eyes in images caused by the response of the human eye to electronic flashes.
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Red eye

An image in which a subject’s iris or irises are red instead of black. The red eye effect is caused by light from a flash traveling through the iris and illuminating the retina at the interior back of the eye–– which is red in color due to its blood vessels –– and the camera capturing that redness on film or on a digital camera s sensor.

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Red eye reduction

A feature of some cameras or flash units that is meant to reduce the effect of red eye by emitting a short initial flash or multiple bursts of light immediately before the picture is taken. The intended result is a forced reduction in the size of the subject s iris.

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Red eye reduction

If you ve ever taken a photo in low light using a compact camera or an SLR with built-in flash you will have no doubt come across a strange effect - people with alien-looking eyes. The reason is simple; the flash lights up all the blood vessels in the eye which reflect back into the lens. The further away the flash is from the lens the less likely the chances of this strange phenomena occurring. The problem with built-in flash is that you can t control where the flash fires from. To overcome this, many cameras have a red-eye reduction mode, but it is, as the name suggests, only a reducer. It works by firing a pre flash to reduce the size of the pupils, and in doing so reduces the area of red. The redness is still usually apparent, but because the pupil is smaller the effect is less noticeable. There are three methods used in cameras to reduce red-eye. One is a single pre flash. This is quite bright and can fool the subject into thinking the picture has been taken. So you avoid red-eye but have a picture of a person either looking away or blinking. The second method fires a less powerful, but equally distracting, sequence of flashes, almost like a strobe. This can result in the unaware person shielding their eyes from the potential epilepsy inducing strobe! Version three tends to be the most subtle - a torch-like light that shines for about five seconds before the flash is taken. The only downside of this is battery drain. If you have a computer you can remove red-eye digitally using image editing software. If you don t there are special pens available that you can use to colour in the red on your photos. .

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Red eye reduction

SIstem de reducere a reflexului rosu cauzat de pupila mare care lasa sa se vada retina, bogat vascularizata. De obicei se foloseste o lampa auxiliara sau un numar de mici descarcari ale blitului, care se presupune ca inchid pupila si fac sa fie mai putin vizibil fundul ochiului. Cel mai bun sistem este indepartarea blitului de axa optica, totusi. .

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Red eye reduction

Sistem de reducere a reflexului rosu cauzat de pupila mare care lasa sa se vada fundul corneei, bogat vascularizat. De obicei se foloseste o lampa auxiliara sau un numar de mici descarcari ale blitului, care se presupune ca închid pupila si fac sa fie mai putin vizibil fundul ochiului. Cel mai bun sistem este îndepartarea blitului de axa optica.

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