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6.5. Red-EyeLet's say you snap a near-perfect family portrait: the focus is sharp, the composition is balanced, everyone's smiling. And then you notice it: Uncle Mitch, standing dead center in the picture, looks like a vampire bat. His eyes are glowing red, as though illuminated by the evil within.
You've been victimized by red-eye, a common problem in flash photography. This creepy possessed-by- aliens look has ruined many an otherwise -great photo. Red-eye is actually light reflected back from your subject's eyes. The bright light of your camera's flash passes through the pupil of each eye, illuminating the blood-red retinal tissue at the back of the eye. This illuminated tissue , in turn , is reflected back into the camera lens. Red-eye problems worsen when you shoot pictures in a dim room, because your subject's pupils are dilated wider, allowing even more light from the flash to illuminate the retina . Page 62 offers advice on avoiding red-eye to begin with. But if it's too late for that, and people's eyes are already glowing demonically, there's always iPhoto's Red-Eye tool. It lets you alleviate red-eye problems by digitally removing the offending red pixels. Here's how:
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