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回顾过去五十年,有很多促进洗印工艺的重大变化。胶片与间歇式摄影机的结合产生了电影。具有影响的下一个阶段,是第一台连续式洗片机,出现于一九二○年前后,据信是由德国人采用的。在这以后,一九二九年出现了光学声带和随后几年出现的特艺色染印法系统。用此法制作的首批商业产品大约是在一九三四年。最早的内偶合成色剂减色法系统是一九三六年的新阿克发彩色系统。大约在第二次世界大战末期,底—正拷贝开始在德国出现。底片—正片彩色法用于各个洗印厂,是在一九四七年至一九五二年间。经过一段长时间而扩展到不同的国家。
Looking back over the past 50 years, there have been many major changes that have fueled the printing process. The combination of film and batch camera produced the movie. The next stage of influence was the first continuous film processor, which appeared to have been used by Germans around 1920. After that, optical vocal cords appeared in 1929 and a system of special art dye-printing systems that emerged in the following years. The first batch of commercial products made by this method was around 1934. The earliest coupling couple coupler subtractive color system is the 1938 new Acker hair color system. Around the end of World War II, the end-positive copy began to appear in Germany. Negatives - The positive color method used in various photofinishing plants was from 1947 to 1952. After a long period of expansion to different countries.