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LAD法是柯达公司根据依斯曼胶片的特性及其加工工艺,运用特性曲线直线部分的中间点来控制胶片密度的一种方法。LAD法不仅能较好地利用各种胶片的感光性能,而且也能指导底片曝光,使底片密度基本一致。此外,还能控制后期制作过程的工艺条件。使用此法的条件是:胶片统一性要好,反差要平衡,正负片、中间片要配套使用,以及药液要严格控制。运用LAD法可把底片曝光密度与反正、反底、原底拷贝、反底拷贝的制作过程密切联系起来,使工艺过程可靠、简便,并可得到较满意的效果。
The LAD method is a method by which Kodak controls the film density based on the characteristics of Isman film and its processing technology, using the midpoint of the linear part of the characteristic curve. LAD method can not only make better use of the photosensitive properties of various films, but also guide the film exposure, so that the film density is basically the same. In addition, you can control the post-production process conditions. The conditions for using this method are: better film uniformity, contrast should be balanced, positive and negative films, intermediate films to be used in conjunction, and the liquid to be strictly controlled. The use of LAD method can film exposure density and anyway, the bottom, the bottom copy, the bottom copy of the production process are closely linked, so that the process is reliable, easy and can be more satisfactory results.