In the ambient light, your subject's eyes won't react as strongly to the flash. You can also turn on some lamps in the room where you're shooting. For example, some point-and-shoots allow you to dial down the flash intensity by one or two increments. If your camera doesn't come with this feature, you can still reduce the red-eye effect by adopting a few simple techniques. The first flash causes the subject's pupils to contract before the second, image-producing flash fires. Some cameras try to reduce red-eye by triggering a double flash. The reflected red light emerges from Molly's eyes and comes straight back to your camera, transforming your sister into Beelzebub. When light strikes the reddish tissue, all wavelengths get absorbed except red, which gets reflected. The choroid comes equipped with a generous supply of blood vessels, which help nourish the retina.
Some of that light (the same light that reveals your sister's goofy smile) passes through her pupils and strikes the part of her eyes called the choroid at the back. When the camera flashes, her eyes react, but her pupils can't contract quickly enough to beat the sudden, intense illumination. In a dark room, the pupils of Molly's eyes open up to let more light in, which helps her see better. Let's say you're photographing your sister Molly at a Saturday-night party. Unfortunately, most point-and-shoot cameras produce the dreaded red-eye effect when they're used to snap portraits in low light.Ī quick anatomy lesson can help you understand why it happens. But if you're a human (and haven't been bitten by a vampire or possessed by a demon recently), then red eyes can be a bit unsettling.
If you're a fruit fly, then red eyes look pretty awesome.
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