前景和背景颜色选择，改善可读性。
Foreground and background color selection, to improve readability.
实现图像的抠图功能，即把前景和背景分开。
In order to matting image, that is to separate the foreground and background.
JFaceColors可以把特定颜色动态指派给小部件的前景和背景。
JFaceColors can assign specific colors to the foreground and background of a widget dynamically.
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