How to reduce red eye in portrait photography

Reduce and prevent the red pupil of portraits;

First, the subject's eyes should not look directly at the camera.

Second, the flash of the camera should not shine on the subject, but should reflect the light and trigger the flash of the studio.

Third, the ambient light is stronger, which narrows the pupil of the character.

Fourth, if the camera flash has the function of pre-flash and anti-red pupil, it should be turned on.