【源碼】紅藍顏色映射生成器，零爲白色或黑色

生成一個紅-藍顏色映射，0爲白色或黑色。 Generates a RED-BLUE colormap with zero as white or black. 正值顯示爲藍色強度，負值顯示爲紅色強度。 Positive values are displayed as blue intensities and negative values are displayed as red intensit

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