How to get rid of red eye in mobile phone retouching

Most of the red eyes when taking pictures are after using the flash. When we are in a dark scene, photographers usually turn on the flash to fill the light, while in dark conditions, people's pupils will be enlarged a lot in order to see things around them clearly. At this time, turn on the flash to take a picture, and the sudden strong light will make the pupil shrink too late, and all the light will enter the human eye, and then the light reflected by the blood vessels on the iris will enter the camera lens, making the human eye in the photo appear red, which is what we call "red eye".

Simply put, this so-called red color is actually the light reflected by the retina in our eyes.

Why is there a "red eye" when taking pictures? Is there any way to solve it?

Why is there no "red eye" when you shoot animals with a flash at night?

At this point, some people may have doubts. Why didn't I shoot the cat with a flash before, and its eyes showed "red eye"?

That's because their retinas are different from those of humans. Generally speaking, like some nocturnal animals (such as cats and dogs), there is a layer called "photosensitive membrane" on their retinas. Usually, there is a triangular area with blue-green metallic luster on the back wall of choroid, which is the photosensitive membrane area. Because the retina in this area has no pigment, it reflects light strongly, which is helpful for animals to perceive light in the dark environment.

When we take pictures of it with a flash, their eyes will automatically reflect dazzling white light, which is similar to reflected light, thus avoiding "red eye" well.

Why is there a "red eye" when taking pictures? Is there any way to solve it?

How can I avoid "red eye" when taking pictures?

In order to get everyone's approval, photographers have to ensure the imaging effect of photos. Don't be spit out because of "red eye". After understanding the causes of "red eye", below, I will tell you how to avoid this situation and take satisfactory photos.

First turn on the camera's "red eye" function.

Basically all cameras now have the function of "eliminating red eye". When they are turned on, the flash will flash twice, the first time before taking pictures and the second time when taking real scenes. When the flash flashes for the first time, people's pupils contract, and when they really take pictures for the second time, the situation of "red eye" can be well alleviated.

How does the camera set the "Red Eye Elimination" function?

Find the flash option and select "Red Eye Prevention".

Why is there a "red eye" when taking pictures? Is there any way to solve it?

Some cameras are like this, but they are all similar. You can look for them in detail in the manual.

Why is there a "red eye" when taking pictures? Is there any way to solve it?

So, what if the camera doesn't have the red-eye prevention function?

Here are two tricks for everyone. Although it seems a little meaningless, it is still effective.

The first trick is to take two photos in a row, just don't take the red eye in the first one. Anyway, now is the digital age, and we are not afraid to waste film. But this method has the disadvantage that the probability of blinking will increase.

The second trick is to let people stare at the light for a while, or turn on the flashlight to let people stare for a while, so that the pupils automatically contract before taking pictures, which can also alleviate red eye to some extent.

Why is there a "red eye" when taking pictures? Is there any way to solve it?

Second, improve indoor lighting.

Since the red eye is caused by the photographer using the flash, we can artificially improve the lighting of the indoor environment, such as turning on all the lights in the room. When the shooting scene gets brighter, there is naturally no need to fill the light with a flash. Even if a flash is needed, there is little difference in the surrounding light environment at this time, and the red eye phenomenon will be reduced.

Why is there a "red eye" when taking pictures? Is there any way to solve it?

Third, avoid putting portraits and flashlights on the same level.

Especially for big photos, some people have red eyes and some people don't. Why? It is possible that the angle of the flash just avoids them, and they are not on a horizontal plane.

Similarly, if there is really no way to change the indoor lighting problem, then try to raise or lower the illumination angle of the flash as much as possible, as long as it is not on a horizontal plane with the portrait, the "red eye" situation can be alleviated to some extent.

Why is there a "red eye" when taking pictures? Is there any way to solve it?