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8.6. Red-Eye

Red-eye is 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, which 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. (See the top picture in Figure 8-6 for an example.)

If it's too late to avoid red-eye to begin with (by using an external flash, for example), and people's eyes are already glowing evilly, iPhoto's Red-Eye tool lets you alleviate red-eye problems by digitally removing the offending red pixels. Here's how:


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