Red-eyed Images – Another Magic Of Optics!
May 9th, 2012Often we get alarmed after looking at our red-eyed images. Do not be afraid, your mind is not playing any tricks on you. It is just the magic of optics. You may not face the same problem while making a corporate video but when taking pictures you will find some people with red or orange eyes. You just cannot help but laugh while looking at such snaps. Video production is too advanced to eliminate any such errors however; the old cameras never had this feature. While going through childhood photos, one feels spooked as the eyes look eerie. But the question is why pictures had this phenomenon especially when they were captured at night?
The answer relies in the human retina. So you have to look into a human eye to get the answer. What happens is when the flash of a camera reflects from your eyes at just the right angle to be captured by the camera then you get a red-eye. You will find that humans are a little alone in this red-eye image phenomenon.
For instance, when you take a picture of your dog, cat or any other animal, you will get a totally different thing. You will feel a white shiny spot in the place of their irises. The reason for this is a reflective layer present over their retina. This layer known as tapetum lucidum works like a mirror. Try focusing a headlight or perhaps a flashlight on their eyes. What do you observe? Their eyes will reflect white light as a whole which is why they appear as a bright spots.
The layer present over the human retina is different from the one present in animals. In humans the presence of red spots in images shows a different thing. As we all know, white light has seven component parts. Alternatively, seven colors are part of the visible spectrum. The human retina is capable of absorbing all those light except for one. When a surface cannot absorb a particular color, the other option is to reflect it back. So mainly, the human retina reflects red light which is captured by the camera.
However, it is worth noticing that you would not see any reflection when you shine a flashlight on a human eye. But you will get a certain reflection when you focus a camera flash. Some people think the red color is due to the presence of blood vessels. This explanation is totally vague, because animals also have blood vessels so potentially, they should have the same effect.
The red-eye effect in images was a problem of the earlier decade. But things have changed now. With sophisticated technology at your doorstep, you can use the technique of red-eye reduction for good.
Apart from this, good camera using skills can also help minimize the effect. It is observed that moving the camera flash away can help in minimizing red-eyed images. Some cameras have flashes that are only a single inch away from the lens. If possible try to remove the flash from the camera. You can keep it at a distant place instead. A light bouncing off the ceiling will never cause this problem. As mentioned earlier the red-eyed effect is mainly because of reflection from the retina.
Author Bio: Ellie Lewis has searched the term video production Vancouver to find a company to make training films for her firm. She hired a corporate video Vancouver company to film a marketing film.