在线观看亚洲精品专区-在线观看亚洲免费-在线观看亚洲免费视频-在线观看亚洲欧美-欧美freexxx-欧美free嫩交video

食品伙伴網服務號
 
 
當前位置: 首頁 » 專業英語 » 專業知識 » 正文

為什么照片上眼睛是紅的

放大字體  縮小字體 發布日期:2008-11-05
核心提示:你有沒有這樣的經歷,照片拍出來之后,你才驚訝的發現,自己的眼睛怎么被拍成了紅色的?我們又該如何避免這種情況的發生呢? We've all see photographs where the people in the picture have spooky red eyes. These are photos taken at night with a flash. Where


你有沒有這樣的經歷,照片拍出來之后,你才驚訝的發現,自己的眼睛怎么被拍成了紅色的?我們又該如何避免這種情況的發生呢?

We've all see photographs where the people in the picture have spooky red eyes. These are photos taken at night with a flash. Where do the red eyes come from?

The red color comes from light that reflects off of the retinas(視網膜) in our eyes. In many animals, including dogs, cats and deer, the retina has a special reflective layer called the tapetum lucidum that acts almost like a mirror at the backs of their eyes. If you shine a flashlight or headlights into their eyes at night, their eyes shine back with bright, white light.

Among many nocturnal vertebrates the white compound guanine is found in the epithelium(上皮細胞) or retina of the eye. This provides a mirrorlike surface, the tapetum lucidum, which reflects light outward and thereby allows a second chance for its absorption by visual pigments(視色素) at very low light intensities. Tapeta lucida produce the familiar eyeshine of nocturnal animals.

Humans don't have this tapetum lucidum layer in their retinas. If you shine a flashlight in a person's eyes at night, you don't see any sort of reflection. The flash on a camera is bright enough, however, to cause a reflection off of the retina -- what you see is the red color from the blood vessels nourishing the eye.

Many cameras have a "red eye reduction" feature. In these cameras, the flash goes off twice -- once right before the picture is taken, and then again to actually take the picture. The first flash causes people's pupils(瞳孔) to contract, reducing "red eye" significantly. Another trick is to turn on all the lights in the room, which also contracts the pupil.

Another way to reduce or eliminate "red eye" in pictures is to move the flash away from the lens. On most small cameras, the flash is only an inch or two away from the lens, so the reflection comes right back into the lens and shows up on the film. If you can detach the flash and hold it several feet away from the lens, that helps a lot. You can also try bouncing the flash off the ceiling if that is an option.  

更多翻譯詳細信息請點擊:http://www.trans1.cn
 
關鍵詞: 照片 眼睛
[ 網刊訂閱 ]  [ 專業英語搜索 ]  [ ]  [ 告訴好友 ]  [ 打印本文 ]  [ 關閉窗口 ] [ 返回頂部 ]
分享:

 

 
推薦圖文
推薦專業英語
點擊排行
 
 
Processed in 3.150 second(s), 585 queries, Memory 2.66 M
主站蜘蛛池模板: 视频h在线 | 7m凹凸精品分类大全免费 | 天堂tv亚洲tv日本tv欧美人tv | 国产一区二区影院 | 日本三级黄色录像 | 男人的天堂欧美 | 高清成年美女xx免费网站黄 | 4338×亚洲全国最大色成网站 | xxxx性欧美高清 | freesex欧美| 日本不卡一区二区三区视频 | 卡1卡2卡3精品推荐老狼 | 激情五月激情综合网 | www.四虎影院在线观看 | 手机看片1024免费视频 | 天天伊人 | 天天碰夜夜操 | 男人j桶进女人j的视频 | 深夜动态福利gif进出粗暴 | 视频在线欧美 | 99青草 | 男人女人真曰批视频播放 | 亚洲欧美网 | 亚洲 欧美 另类 综合 日韩 | 欧美成人午夜不卡在线视频 | 九九美剧 | 亚洲一区二区福利视频 | 五月综合激情网 | 国产在线播放你懂的 | 色综合久久九月婷婷色综合 | 可以免费看黄的网站 | 久久天天综合 | 丁香在线| 色偷偷女男人的天堂亚洲网 | 国产精品女丝袜白丝袜 | 好爽好深太大了再快一点 | 成人性视屏 | 手机看片久久青草福利盒子 | 国产乱码一区二区三区四川人 | 欧美高清性色生活 | 欧美在线高清视频 |