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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Set your foreground color to light gray and background to white.

设置前景色为浅灰色，背景为白色。

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Change your foreground color to black and your background color to white.

更改您的前景颜色以黑色和您的背景颜色为白色。

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Change your foreground color to black and your background color to white.

更改您的前景颜色以黑色和您的背景颜色为白色。

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