What is red eye removal in photo production? What's the role?

First, the "red eye" in the photo means that the pupil of the person or animal being photographed turns red, which is mainly the reason why the strong light of the flashlight shines on the capillary behind the retina in the dark environment. This phenomenon mostly appears on the models with a small included angle between the camera lens and the flashlight. For example, various lightweight digital cameras, for the sake of portability, design different elements in the camera quite compactly, so it is easy to produce red eyes in their works. So how to effectively remove the red eye in the taken photos? We can start from both soft and hard aspects: 1, the camera's own function. At present, many digital cameras have flash mode to eliminate red eye, which actually decomposes the flash process into two times. The flash will light up once after pressing the shutter to reduce the pupil to a certain extent, and then flash once when the camera officially records the photo to avoid the reflected red light. 2, light source and subject First of all, we can try to avoid shooting in dim light, and after turning on the red-eye removal function, we must try to ensure that the subject's eyes are facing the flash, otherwise there will still be red-eye regeneration. 3. Selection of Flash In some digital cameras with slightly better performance, hot boots connected with advanced flash are reserved for users. When shooting, we can adjust the upward direction of the flash by 30-40 degrees, so as to generate brighter ambient light and reduce the probability of red eye formation. 4. There are many softwares that can modify pictures to remove red eyes. Taking PhotoShop as an example, we can use the ellipse selection tool to select the position of the whole black eyeball, and then click Adjust in the image menu to reduce the hue saturation. Finally, we can add the area around the black pupil to make the photo look more delicate and natural. Secondly, since the invention of the flash bulb, red eye is a common phenomenon in photography. Red eye is caused by the light from the camera flash reflecting from the back of the eye (retina) of the subject and entering the camera lens. Because the retina is covered with blood vessels and appears red, the eyes of the subject in the final image are "red". Red-eye phenomenon does not mean that there is anything wrong with the subject's eyes. If the flash is actually very close to the lens (almost all small cameras have it), the light emitted by the flash will directly enter the eyes and reflect back to the camera. In addition, if the subject's pupils are dilated (in a dark room), it will also increase the chance of red eye. To reduce red eye, please try to use the following techniques: Keep the flash away from the camera. Use the off-camera flash (if possible) to prevent light from directly entering the eyes of the subject, thus reducing the phenomenon of red eye. Backlit flash points the flash at the ceiling to soften the light and prevent it from directly reflecting from the eyes to the lens. Enhancing ambient lighting and indoor lighting can narrow the pupil of the subject and reduce the phenomenon of red eye. Use the "Red Eye Elimination" mode on the digital camera. In this flash mode, the flash flashes several times before the actual exposure, thus narrowing the pupil of the subject to reduce the red eye phenomenon. Let the subject watch a little away from the camera, which is helpful to change the angle of light reflection and reduce the phenomenon of red eye. Sometimes these technologies may not be able to eliminate red eye. This situation can be handled by using the image editing software on the computer after taking pictures. Nikon View 6 has a powerful red-eye removal function, and the photographer can automatically or manually remove the red-eye phenomenon on the subject's eyes after taking pictures. Red eye may appear when shooting animals, but the reflected light may be yellow, green or other colors due to different eye structures. The same technology mentioned above can also be used to eliminate these reflected lights produced by animal eyes. Photoshop has really put a lot of effort into repairing images. The CS2 version adds the stain repair brush tool, plus the repair brush tool, repair tool and imitation stamp tool before the CS version, which are the four tools most needed to repair old photos. Although these four tools have their own uses, their working methods are basically similar. Visible:/photo/college/houqi/061/911281.html.