Have you ever seen a mysterious red in a person's eye in a photo? Where does this red come from, and why does it appear in the photo? Today, we're going to unravel the mystery.
First of all, we need to understand that red in the human eye is not real. In fact, the human eye is transparent and has no color. So, what's the red eye in the photo?
This starts with how the camera works. The camera captures light through the lens, projects an image of the object onto the image sensor, and then converts the light signal into an electrical signal through a series of complex chemical reactions, which ultimately form the picture we see. In this process, the camera's sensitivity to light is very high.
Sometimes, when we are taking a photo, the camera will catch some light that we can't see with the naked eye. These rays may be due to some special substances in the environment, or to certain characteristics of the camera itself. When these rays enter the camera and are captured by the sensor, they can have some special effects on the photo, such as making people's eyes appear red.
This red-eye phenomenon is known in photography as the "red-eye effect". It appears because the camera is particularly sensitive to certain wavelengths of light when it captures light. These specific wavelengths of light may give a person's eyes a red appearance in a photo.
So, how to avoid the red-eye effect? In fact, it is very simple, you only need to ask the subject to avoid looking directly at the camera when taking pictures, or use some special photography techniques, you can effectively reduce the appearance of the red-eye effect.
Here, I would like to leave a question for you to ponder:
Have you ever encountered a similar phenomenon in your life, that is, the real appearance of things is different from what we see in the photos?
In general, the people in the photo have red eyes, not because they actually have red eyes, but because the camera is particularly sensitive to certain wavelengths of light when it captures light, resulting in the red-eye effect. This phenomenon reminds us that photos are not always completely real and that they can change for various reasons. This is also one of the charms of photography, it allows us to see different sides of things and gives us a deeper understanding of the world.