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1·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。

2·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。

3·A master of tonal gradation and soft edges, he prepared the way for the Impressionist landscape painters and had an important influence on Claude Monet, Camille Pissarro, and Berthe Morisot.

柯洛是精通色调渐层法和柔和边线的大师，他替印象派风景画家们开辟了一条道路，对后来的画家莫内、毕沙罗和摩里索影响很大。

4·The outer rectangular bounds and tonal-gradation information are employed to be eigenvectors to match respective targets, so as to get the speed of them.

利用最小外接矩形和灰度信息作为各目标的特征向量，匹配各目标对象，以求取各目标运动速度。