Continuous tone: a image in which tonal gradation is produced by gradually changes of density.
连续色调：由渐变密度构成的不同色调层次的图像。
Continuous tone a image in which tonal gradation is produced by gradually changes of density.
连续色调由渐变密度构成的不同色调层次的图像。
Oxide film in the expected tone of such color can be obtained by controlling current density, square—wave cycle period and number of the repetition cycles.
通过调节电流密度，方波周期和通电次数等可获得预期色调的着色膜。
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