将要处理的图像底片经过郎奇光栅的调制、显影、定影后得到二维的编码片。
The plate to be processed is modulated by ronchi raster and after developing and fixing two dimensional coding photograph is made.
大苏打：英文是硫代梳酸钠的简称。是显影后把照相影像定影的化学剂。
Hypo: Abbreviation for sodium hyposulphite, a chemical used to fix photographic images after development.
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