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.
夜里，收敛到接近灰阶的公领域，独留天顶光带转折迂回的绚烂余韵绕梁。
As night approaches, it converges with the near-gray public area. Only the zenith light remains on to serve as a lingering reminder of splendor.
赛场地面由一层有灰阶的哑光印刷纸覆盖。欲知当地厂商详情，请浏览官方网站。
The floor of the playing field is covered with a printed, matte greyscale. See your national web site for local suppliers.
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