HP Photosmart E327 - Manual (Page 27)

27 Taking pictures and recording video clips
Red eye
The red-eye phenomenon is caused by light from the flash
reflecting off the subjects’ eyes, which sometimes makes a
human’s eyes appear red or an animal’s eyes appear green
or white in the captured image. When you use a flash setting
with red-eye reduction, the camera flashes quickly up to three
times to cause the subject’s pupils to contract, thus reducing
the effect of the red-eye phenomenon, before the camera
uses the main flash. It will take longer to take a picture using
red-eye reduction, because the shutter is delayed for the
additional flashes. Therefore, make sure your subjects wait
for the additional flashes.