Why can I have red eyes when taking pictures?

In photography, "red eye" generally refers to the phenomenon that the pupil of a person or animal turns red in the photo, but the pupil color of the subject itself is not red in real life.

Because the angle of light entering the eyes is the same as the angle of reflection when taking pictures, the closer the flashlight is to the eyes, the easier it is for the reflected light to reflect on the photosensitive element. If you are in a dark environment, the bigger the pupil, the greater the chance of erythema in your eyes.

There are other factors that may also cause "red eye", such as the content of melanin in the tissue layer behind the retina and the age of the photographer. Compared with people with dark skin and brown eyes, people with light skin and blue eyes have less melanin in the fundus, so they are more prone to "red eye". Because children's pupils dilate faster than adults' in dark environment, children's eyes in photos are also more prone to "red eye".

Since entering the era of digital photography, "red eye" can be easily eliminated in various later software. But what we are going to talk about next is how to avoid "red eye" in the early stage. Since it is a problem that can be solved in the early stage, we should directly avoid the early stage.

Camera "red eye elimination function". When using the flash, the flash will cause the pupil to contract to a certain extent. At this time, flashing once when the camera officially records photos can avoid the reflected red light.

Don't let the flash line point at the eyes. You can stagger the reflection channels a little higher, lower or sideways so that the reflection of capillaries is not projected into the camera.