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摄影放大法制投影片与放大照片相仿,二者的区别主要在于所用感光材料不同,放大照片是用相纸,制投影片必须用透明片基的银盐感光材料,因此摄影放大法制投影片的关键是选择合适的具有透明片基的感光材料,并正确运用放大技法以满足制作投影片的一些特殊要求。一、制投影片用黑白感光材料目前,国内外尚无专门为制作投影片而生产的感光材料,因而制作投影片只能选择为其它行业生产的透明性感光材料代用。国内生产的并可用来制作投影片的黑白感光材料以及相应
Photographic enlargement Legal films and enlarge photos similar to the difference between the two is mainly used in different photographic materials, enlarge the photo is a photographic paper, the film must be made of transparent silver-based photographic film-based materials, Is to choose the right transparent film-based photosensitive material, and the proper use of amplification techniques to meet the production of some special requirements for the projection film. First, the system used black and white photographic film materials At present, there is no specific domestic and foreign production for the production of photographic photographic materials, and thus the production of projection film can only choose for other sectors of the production of transparent alternative to light-sensitive materials. Domestic production and can be used to make projection film black and white photosensitive materials and the corresponding