我玩过不少胶片，滤镜玩过但不多，我没自己冲洗过，但我知道即使插彩色滤镜，黑白胶片出来的仍然是黑白
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你如果说湿板我拍过。

拍人像坐着不能动。为了防止人挪动，有时在人的后脑有个架子，把后脑靠在架子上。早期黑白片都曾经需要人在太阳底下坐十几分钟，想想那时的人像是怎么拍的！

现在的人无法想象过去是怎么做的，许多人都以为过去的人做不到。

首先这种拍摄方式不适合人物。所以这张照片是否真的是1911年的我不清楚，20年代主要是这个办法。

The Bermpohl is a one-shot camera for colour separation negatives. Three negatives are produced for red, green and blue images with the appropriate colour filter positioned in front of each negative. The light is divided behind the lens by two semi-silvered mirrors. To prevent double images being formed by reflection from the back of the mirror it is coated, on the back, with the minus colour for the negative to which it is directed.
There were many designs for similar cameras using two, or sometimes three, mirrors to separate the light. The differences centred around the position and angle of the mirrors and how to overcome the two problems of refraction caused by the mirror and equalising the optical path. Light passing through the semi-silvered mirror is refracted, as the light strikes the mirror at an angle the image will be in a different plane and at a slight angle to its position if there were no refraction. Suggestions to overcome this problem included using wedge shaped mirrors or placing another clear glass at an opposite angle in the image path (this was suggested in Pfenninger's patent 25907 of 1906). Dawson (patent 24538/12) suggested skewing the sensitive plate by means of adjusting screws near the plate holder. This is also proposed in Wilhelm Bermpohl's patent for this camera (US patent 1951896, filed March 1930, granted 1934), the patent shows two of the image planes skewed slightly. The second problem is to ensure that the optical paths of the three images are the same, in the Bermpohl clear glass plates are positioned in front of the red and blue images, the green image passes through the 'red' and 'blue' mirrors. The filters are of different thicknesses.
Thecamera was popular in studios especially for advertising work. The negatives would have been used in photomechanical processes or for producing photographic prints (e.g. carbon, carbro, etc.).
The Bermpohl was produced in three sizes: 9 x 12 cm, 13 x 18 cm and 18 x 24 cm. Different filter sets were available to match the colour temperature of the light.
暗房归来2 编辑于 2023-04-20 20:42

不是这样做的，这样做只能拍摄静态风景照片。这类人像有专门的内部棱镜分光。这张照片是不是1911年的？
暗房归来2 编辑于 2023-04-20 20:22

对了一半，它不是分开三次拍，因为那样照片拼不上。这类相机内部有个棱镜把成像分成三个单色感光的干板位置。其实就是一次拍摄三张分色后的单色片。
暗房归来2 编辑于 2023-04-20 20:12

是的，就是分别扫描到电脑合成通道。

当时是怎么用拍好的三色黑白片生成彩色片的？在同一张彩色相纸上用三色黑白片配合三色滤光片做三次曝光吗？

其实现在数码时代也可以再玩一玩，用黑白胶片和三色滤光镜生成三色黑白片。然后都扫描到电脑中，在电脑中进行三色合成，会很方便。

曾经用hp5黑白片彩色rgb滤镜拍过彩色，颜色非常纯净。
就是麻烦

名片《乱世佳人》就是Technicolor的彩色片。

我又学到使用黑白胶片做中间片大规模复制彩色电影胶片的染印法。

染印法是用照相方法制作模片、用三色套版印刷方式生产彩色影片的工艺。

染印法（Technicolor）又称“特艺彩色”，是用照相方法制作模片，用三色套版印刷方式生产彩色影片的工艺。具有色彩鲜艳、不褪色、声带还音质量好等优点。制作出一套模片（浮雕片）后，可以大量拷贝彩色片，生产过程以自动流水线完成，效率及经济效益很高。染印法是一种以工业规模大量生产彩色片的方法。

用减色法原理制作彩色影像的一种工艺方法。制作过程大致可分三步:

(1) 摄制原底:用普通多层彩色负片拍摄。
(2) 制作分色浮雕片:用三条内含阻光染料高反差浮雕片,经原底加蓝、绿、红三原色滤色片从背后曝光。经坚膜显影后，溶去无影像部位明胶，漂去银影，形成三条凹凸的明胶浮雕分色模片。
(3)染印正片：用三条浮雕片浸入黄、品红、 青染料中转印到空白片上，便获得彩色正像。画面质量较高，成本较低， 宜于大量拷贝电影胶片。



向化学博士致敬！ 我对这位化学博士一直报正面印象。虽然我也曾较早地删除了他的微博账号关注。因为当时他话太多太唠叨，每天都发很多微博。不过他现在不会发微博了吧？我的微博账号都被封10年了。

这种使用滤光镜在黑白胶片上分色成像再在后期合成彩色照片没啥奇怪的地方。

比较奇特的是80年代90年代搞的使用三色光栅在黑白胶片上生成彩色照片。
并且江西光学总厂还生产了配套的照相机。

https://xueshu.baidu.com/usercenter/paper/show?paperid=adef6315ccc031d78c0cddc119f9da95

好像这个博士就是做科普的

今年北京博士毕业比本科的多

他用黑白胶片通过红、绿、蓝三色滤镜拍摄三张黑白底片，分别制作三块印刷用的“版”。蓝版蘸蓝色油墨、绿版蘸绿色油墨，红版蘸红色油墨，分三次在白纸上印刷。白纸上呈现的就是彩色照片。

这方法本质上与后来的彩色胶片摄影和彩色数码摄影是相同的，只不过后面的“三原色合成彩色”过程不用人工再做了。

最早的彩色照片就是三原色滤镜拍三张然后拼合啊。
洗出来是黑白的不代表你不能给它染上RGB色啊？
这个原理在现在的电视摄像机上还在用，3CCD
这个办法就是先用红色滤镜拍一张，换上绿色滤镜拍第二张，再换蓝色滤镜拍第三张，被摄体该过程不能动，相机也不能动。拍摄结束冲洗，洗出来的照片分别染上RGB三种颜色套在一起，拼合，就得到彩色照片了

A picture of Alim Khan (1880-1944), Emir of Bukhara, taken in 1911. This is one of the earliest color photographs in existence and was originally taken by Sergei Mikhailovich Prokudin-Gorskii as part of his work to document the Russian Empire. It was taken using three black-and-white exposures, with red, yellow and blue filters respectively, long before color photographic printing existed. The three resulting images were projected using color filters to create a color projection. More recently, the Library of Congress has scanned Prokudin-Gorskii's work and contracted with other firms to produce high-resolution color images from the black and white scans.

专家的话