The gradient is defined by four effect points, the positions and colors of which can be animated using the Positions & Colors controls.

该渐变被四个作用点控制，作用点的位置和颜色可以通过位置和颜色参数的变化制作动画。

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Coal maceral concentrates of high purity were prepared from four different rank coals by Density Gradient Centrifugation method.

经等密度梯度离心分离，从褐煤、长焰煤、气煤和贫煤四种不同变质程度煤中获得了高纯度的有机显微组分。

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Aiming at characteristic differences of background and target, four-direction gradient is extracted out and areas with large gradient are smoothed by a linear threshold filter.

针对复杂背景及目标的分形特性差异，提取图像四个方向的灰度梯度，选择最小梯度大于阈值的区域进行平滑滤波，最后对分维参数进行分段线性拉伸。

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