方法：使用电热干燥箱作热源，用密度计测量胶片上各级灰阶的密度。
Methods: to employ an electrothermal drier as a heat source and measure density of grey scale in film with a densitometer.
密度计是一种测量胶片感光性能的专用仪器。
Densitometer is an apparatus used for measuring photosensitivity of films.
密度计是一种测量胶片感光性能的专用仪器。
Densitometer: an optical instrument used to measure the intensity of transmitted or reflected light.
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