The upDev and downDev variables and comparison logic are designed to acquire these contiguous tonal changes if they deviate more than the MAX_TONE_DEV variable.
当偏差值超过 MAX_TONE_DEV 变量时，upDev 和 downDev 变量以及比较逻可用于采集连续音调变化。
The colour and degree of tonal changes achieved will vary according to the type of paper: ranging from cool chocolate-brown, through purplish brown, to little discernable change.
经过硒调色图片的颜色和色调变化在不同的相纸上有不同的表现：从冷调褐色、到紫褐色，有着很细微、可辨别差别。
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。
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