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一、底片的基本知识1.密度胶片经过曝光、显影等过程以后,乳剂膜里的卤化银被还原成黑色的金属银粒,留存在底片的胶膜里。因为银粒不透明,能阻止光线的通过,所以胶膜里含银多,阻光就大,而透过的光线就少;胶膜里含银少,阻光就小,透过的光线就多。在胶膜里银粒积存的数量,就是底片上的密度。银粒数量多,密度大;银粒数量少,密度小。所以,密度单位是根据光线的透过量采用光学测定办法制定的。例如,底片某一部位对投射来的光线透过去1/10,则这个部位的密度就被定为1,透过1/100,密度定为2,透过1/1000,密度定为3,透过1/10000,密度定为4。从以上可以看出,密度越大,透过光线的量越少;密度越小,透过光线的量就越多。底片对于光线的透过程度称为透明度(透光率),
First, the basic knowledge of film 1. After the density film exposure, development and other processes, the silver halide emulsion film is reduced to black metal silver particles, leaving the film in the film. Because silver opaque, can prevent the passage of light, so the film contains more silver, light blocking on the large, and the light through less; film containing less silver, light blocking is small, the light through the more . The amount of silver particles deposited on the film is the density of the film. A large number of silver particles, high density; Silver particles less, less density. Therefore, the density unit is based on the amount of light through the use of optical measurement methods developed. For example, a part of the film through the projection of the light through to 1/10, then the density of this site was set to 1, through 1/100, the density is set to 2, through 1/1000, the density is set to 3, Through 1/10000, the density is set to 4. As can be seen from the above, the greater the density, the less the amount of transmitted light; the smaller the density, the more the amount of transmitted light. The degree of transparency of the film to light is called transparency (light transmittance)