ASA曝光指数∶由美国国家标准学会规定，标明胶片对光的敏感程度的指数或感光速度。

ASA Exposure: Index or speed rating that denotes the film sensitivity, defined by the American National Standards Institution.

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印片颗粒指数的测试点应根据彩色负片的感光特性确定，为正常扩印时对应正片0 .74中灰密度的负片密度点。

The film measuring point of print grain index should be made according to its light-sensitive characteristics, being the density corresponding to the 0.74 gray density of color paper when printing;

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印片颗粒指数的测试点应根据彩色负片的感光特性确定，为正常扩印时对应正片0 .74中灰密度的负片密度点。

The film measuring point of print grain index should be made according to its light-sensitive characteristics, being the density corresponding to the 0.74 gray density of color paper when printing;

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