黑白复古的光影世界

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黑白复古的光影世界-旅游管理
黑白复古的光影世界
      21世纪的碘化银纸照相法
xposed
  Larry M. Kushner先生，美国加州皮尔斯学院政法系的兼职教授、美国加利福尼亚州的执业律师、摄影师。他曾是美国海军，也做过商人，是出的新闻工作者，也是出版业的董事长兼总法律顾问，他的社会身份不计其数，人生经历也是丰富多彩。这一次，Larry带着他钟爱的摄
影作品，以摄影师的身份，为我们介绍碘化银纸照相法，带我们领略他镜头下的黑白世界以及中美两国的风土人情。
  策划/王淳  文/ Larry.M.Kushner  图/ Larry.M.Kushner  翻译/刘建波 王淳 匡磊  编辑/ 李敏
  After the Harvest Festival I went on to many other projects over the years. It was only recently my interest in Calotype photography was revived. With most of photography now being digital I thought it might serve some purpose to see if I could improve the quality of the Calotype image using modern photosensitive paper and computer technology， while keeping the inherent tonal qualities of the color blind image. Hence， I set out to develop Calotypes for the 21 Century.
  收获节之后的许多年里我做了很多其他项目，但我最近迷上了碘化银相纸摄影术。现在是数码摄影当家的时代，可我想如果用当代感光材料和计算机技术来提升碘化银摄影相片的质量的话，同时保留盲片独有的影调，或许会别有味道，所以我开始发展21世纪的碘化银纸摄影法。
  I am now using a photographic paper that is not totally color blind. It is a variable contrast photographic print paper and therefore has some sensitivity to other colors than blue. However， the blue light sensitivity is by far dominant. This paper is， also， far more sensitive than the paper I used in the old days， some 35 plus years ago. I estimate the ISO to be as high as “5” （under certain light conditions）. It must be remembered though， that the ISO may be greatly effected by the color of the light being used to make the photograph. The more the light tends to be blue， the higher the ISO. If the light is mostly green or yellow then the ISO will be very low， maybe 1 or 2. The paper has no sensitivity to pure red light. In my darkroom I can have a pure red light bright enough to read a newspaper and the light will not expose the photo-paper.
  我现在用的相纸不完全是盲纸，我用可变反差相纸，因此除了蓝以外对其他的光也敏感。然而，主要还是感蓝。只是，我现在用的相纸要比35年前用的相纸感光度高一些，我估计ISO感光度在特定光线条件下约有5左右。因此在制作照片时要切记彩可能对ISO产生很大的影响，如果蓝光多，ISO值就高，如果是绿或黄，ISO感光度将会非常低，可能数值只有1或2。相纸对纯粹的红光不感光。在暗室纯粹的红光足以让我读报纸，但不会使相纸
曝光。
  William Henry Fox Talbot in 1839 invented the first successful negative positive photographic process. Photosensitized paper was used in the camera to form a latent （invisible） image. Then the paper was developed to form a visible negative image. The developed negative was placed in contact with an unexposed photosensitized sheet of paper. Then light was passed through the developed negative on to the unexposed sheet of paper. This would form a latent positive image. After development the positive image could be seen. Talbot’s system formed the basis of all modern film based photography.    1839年，威廉·亨利·福克斯·塔尔博特发明了世界上最早的“负—正”摄影术。（这种摄影法的负片是采用在一种优质的书写纸上涂碘化钾和硝酸银，制成一种半透明的纸质负片。）感光纸被放进照相机里形成一种潜在的（看不见的）成像，然后这张感光纸经过冲洗，形成一个可见的负像。被冲洗出来的负片与未曝光的感光纸（氯化银纸）紧贴在一起，光穿过负片到感光纸上，最终形成一个正像（既我们通常说的接触印相）。定影之后可以看见正像。塔尔博特的这种摄影技术奠定了现代胶片摄影的基础。

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