彩照扩放中试片的制作主要靠试验和修正来确定合适滤光片单元。制作试片应具有一台密度计或底片自动测定装置,而且,上述器材的使用,应根据“彩色滤光片”所介绍的底片测定步骤进行,或遵循厂家说明操作。1.将底片放入放大机,乳剂面朝向镜头。采用50R(40R+10R)滤光片(即:50个单位值的红色滤光片),在同一张相纸上,以固定的放大倍率,进行4次分段曝光,使之成为一张带有4个曝光系列条的照片。具 Color photos in the trial production of the expansion mainly by testing and correction to determine the appropriate filter unit. The test piece shall have a densitometer or film automatic measuring device. The use of the above equipment shall be performed according to the procedure of measuring the film described in “Color Filter” or following the manufacturer’s instructions. 1. Put the film into the magnifier with the emulsion side facing the lens. A 50R (40R + 10R) filter (ie, a red filter of 50 units) was used to perform a 4-step sectional exposure at a fixed magnification on the same photographic paper to make it a single band There are 4 exposure series of photos. With