In order to matting image, that is to separate the foreground and background.

实现图像的抠图功能，即把前景和背景分开。

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Make sure your foreground colour is black. See image above.

确认你的前景色为黑色。详见上面图片。

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Make sure your foreground colour is black. See image above.

确认你的前景色为黑色。详见上面图片。

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