使用密度计去推算粒孚的最大直径。
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.
使用密度计的彩色特性应该是一种相对的感觉，对于制卡和会员卡制作材料的工艺控制是非常有用的。
Use the densitometer color characteristics should be a relative sense, with regard to business card printing and membership card materials of process control is very useful.
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