【源码】红蓝颜色映射生成器，零为白色或黑色

生成一个红-蓝颜色映射，0为白色或黑色。 Generates a RED-BLUE colormap with zero as white or black. 正值显示为蓝色强度，负值显示为红色强度。 Positive values are displayed as blue intensities and negative values are displayed as red intensit

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