There are red spots on people's eyes when they take pictures. How can I repair them?

"Red eye" refers to the phenomenon that the pupil of the human eye appears red spots in the photo when taking a portrait with a flash. The common explanation is that in dark environment, the pupil of the human eye will be enlarged. At this time, if the optical axis of the flash is close to the optical axis of the camera lens, strong flash light will pass through the human eye and reflect into the lens. There are abundant capillaries in the fundus, and these blood vessels are red, so erythema is formed. This phenomenon is easy to occur when using the built-in flash near the lens. Red-eye prevention is a function of the flash, which is to flash once before the official flash to narrow the pupil of the human eye, thus reducing the phenomenon of red eye.

The phenomenon of "red eye" often appears when taking portrait photos (especially in close range and dark environment). If you don't want people's or animals' eyes to have "red eye", you can use the "red eye elimination" mode of the digital camera, and let the flash flash once or several times before the main flash and shooting to adapt to people's pupils. When using flash to assist shooting, pay attention to the shooting distance should be within the effective coverage of flash. The built-in flash coverage of middle and low-end digital cameras is limited. In the words of photographers, its flash index is low (generally within 1~9 meters), but it has basically met the needs of ordinary shooting.

Eliminate red eye in photos

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