Red spots appear on your eyes when taking photos at night. How can you avoid this?

Use PHOTOSHOP! Or it can be eliminated with software such as Video Magic

※Many cameras now claim that they can completely eliminate the red-eye phenomenon. Many digital camera flashes have red-eye elimination modes. Is it really possible to avoid this annoying problem? phenomenon? Unfortunately, there is actually no camera that can do this. All they can do is mitigate the effect of the phenomenon to some extent, and of course some cameras do a good job, but the blush phenomenon does still exist.

※The term "red eye" is actually used for photographing people. When the flash shines on the human eye, the pupil will dilate to allow more light to pass through, and the blood vessels in the retina will appear red in the photo. red phenomenon. If the subject's glasses are dark in color, the degree of the redness phenomenon is determined by the depth of the pigment in the photo. Therefore, sometimes the redness phenomenon is not particularly obvious, such as the human eyes in the illustration on the right.

※The phenomenon of red eyes is different for animals. According to experts, red eyes are more common in domestic animals. Pets’ eyes usually have a reflective layer at the bottom of the retina, which can Enhance their ability to see at night. Obviously, the reflective layer of these eye membranes is different from the animal's own coat color, so the phenomena that appear under the stimulation of flash lights will be different. The black dog in the picture on the right has green radiation. layer, so what appears is not a red-eye phenomenon but a green-eye phenomenon.

※The mixed-haired domestic dog in the picture on the left has blue radiating eye membranes, so it will produce a slight blue eye phenomenon under flash light. Some animals, such as some dogs and rabbits, do not have eye membranes that radiate. layer, so the same red-eye phenomenon as humans will appear under flash.

※The red-eye phenomenon in humans is generally caused by the dilation of the pupil to allow more light to pass through when shooting in a dark environment, so the blood vessels of the retina will appear reddish in the photo, while for animals For example, this phenomenon will occur even when shooting in well-lit conditions.

■Red-eye elimination system

◇ There are many different ways to implement the red-eye elimination system, but they are all based on the same concept: reducing the degree of pupil dilation so that the light reaches the retina The amount of light is reduced, thereby reducing the red-eye phenomenon.

◇There are two commonly used methods to eliminate red-eye. One method is to emit bright light in the same direction as the lens. The other method is to start the flash first and then expose, or Shorten flash duration.

◇In fact, neither of the above two technologies can completely eliminate red-eye. There are other factors that are important in eliminating and reducing the red-eye phenomenon. These are factors that go beyond the camera itself.

◇Luck is one of the factors. Why do you say this? If the subject happens to be facing the direction of the camera, the result will surprise you. There is no red-eye phenomenon at all, and you don’t even need to eliminate the red-eye. .

◇The black dog with the "green eye" phenomenon that you just saw above is now normal. There is no red eye phenomenon in the picture. This is because the dog's eyes were perfectly aligned when shooting. Looking at the direction of the camera, everyone can experience it in practice. If you turn on the red-eye reduction function, but the subject's glasses are staring elsewhere at the moment of shooting, the red-eye reduction function will be completely ineffective. As we can see from the photo on the left, when the flash is activated, the The subject looked upward, and although the red-eye reduction function was turned on, the results were disappointing. The red-eye reduction system had no effect on the pupils, and that was the result.

■Tips

◎There are some things we should know when taking photos that require flash. Regardless of whether the red-eye removal function is turned on or not, the following tips can help us effectively reduce red-eye. Phenomenon.

◎ Put yourself in a position with a light source. When you take a photo, the subject’s pupils will not be stimulated by strong light and dilate because they are illuminated by ambient light.

◎It is best not to use flash to shoot in particularly dark places. After turning on the red-eye reduction system, try to ensure that the subject is pointed at the lens;

◎Try to shoot in a place with sufficient light. , so that the pupils will remain in a natural state;

◎Use an advanced flash that can be adjusted in angle. When shooting, the flash should not be parallel to the direction of the lens, but should be moved up to an angle of 30 degrees with the lens. , in this way, the ambient light source is actually generated when the flash flashes, and it can also effectively prevent the pupils from being stimulated and dilated.

◎Creating a suitable light source or determining what kind of situation has the best shooting light is a very difficult part of learning photography. Of course, the difference between professionals and beginners lies in these experiences and skills. Experience It is accumulated continuously.

■Ultimate method

※What should I do if I have taken a photo with red eye phenomenon? Haha, don’t worry, we will use the ultimate method to solve it now and use software to adjust the saturation. To achieve the purpose of eliminating red-eye quickly, this is our Photoshop method.

◆1. Make sure not to touch the surrounding area. We don’t need to say more about the selection method in PS.

◆2. Use the corresponding function (menu command) to reduce the saturation of the area just selected, so as to eliminate red eye. The following is the absolute technique for this operation: If the subject is black or brown For eyes, adjust the saturation of the three main colors (red, green, and blue) to a value close to 0, so as to eliminate red eyes; if the subject has blue or green eyes, adjust the saturation of red among the three main colors. to 0, which eliminates red eye.

◆3. Finally, select the area around the pupil of the eyeball to darken it so that it looks natural.