一、多水平颗粒的概念多水平颗粒(Multilevel-Grain)的概念首先是由Marathay 和Skinner 在1969年提出的。所谓多水平颗粒,是指颗粒在曝光和显影后,它的不透明度可分为许多级差,而且不透明度的大小与曝光量成线性关系。这和卤化银颗粒在一般显影条件时的情况不同。一般情况下,当卤化银颗粒上生成的银原子没有达到一定数量时(例如四个银 First, the concept of multi-level particles The concept of multi-level particles (Multilevel-Grain) was first proposed by Marathay and Skinner in 1969. The so-called multi-level particles, refers to the particles in the exposure and development, its opacity can be divided into many levels, and the size of the opacity and exposure to a linear relationship. This is not the case with silver halide grains under normal development conditions. In general, when the silver atoms generated on the silver halide grains do not reach a certain amount (for example, four silver