HD曲线也称为胶片特性曲线、感光测定曲线或密度测定曲线，是测量摄影胶卷感光性的感光曲线，以19世纪的两位摄影科学家费迪南·赫尔特与维罗·查尔斯·德里菲尔德为名。他们将感光测定及密度测定之科学实践带入摄影胶卷，并研发一种称为光化仪的摄影测光表。[1]
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