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当照相时,照相片子——映像纸,软片,或玻璃板——被压,则其感光性减弱,是为照相的压力效应。设E为照相片子在压力P下得光密度d所需之光照度,若片子不受压力则用光照度E_e即可得此同一之光密度d,故E_e可称在压力P下E之有效照度。吾人实验证明E/E_e为压力P之函数,当p>200kg/cm~2时,E/E_e与P成正比例。 此照相的压力效应,与照相时所用光之颜色,极有关系。黄色光较绿色光为显,绿色光较蓝色光紫色光为显至紫外光则几无此效应。 又此效应之大小,随各种照相片子而不同。就我们所研究的蔡爱斯伊康正色软片,伊司门人像软片,和矮克发等色软片而论,以第一种为最大第二种次之第三种为最小。 这个效应,在实际上,或可有些应用。
When a photo is taken, a photographic film, a piece of photographic paper, a film, or a glass sheet, is pressed and its sensitivity is weakened, which is a pressure effect for photographing. Suppose that E is the light intensity needed to obtain the optical density d of the photo film under the pressure P, and if the film is not under pressure, the same optical density d can be obtained by using the light intensity E_e. Therefore, E_e can be said to be the effective illuminance of E under the pressure P. Our experiments show that E / E_e is a function of pressure P, and E / E_e is proportional to P when p> 200kg / cm ~ 2. The pressure effect of this photography, and the color of the light used in photography, a great relationship. Yellow light is more than the green light, green light is more than blue light purple light to the UV is a few of these effects. The effect of this size, with a variety of photo-specific and different. As far as the Cai Sizi Kang orthodontic films, the ISMANN film fictions, and the Dwarfs hair color films we study are concerned, the third is the second largest and the third is the smallest. This effect, in fact, or some applications.