光谱颜色转换RGB C#_光谱转换rgb在线

需求

光谱颜色转换RGB展示

基础知识

紫外&极紫外&X射线用黑色表示
红外用红色表示

代码

        /// <summary>
        /// 波长转RGB色
        /// </summary>
        /// <param name="lambda"></param>
        /// <returns></returns>
        public static Color WaveLengthToRGB(int lambda)
        {
            double r = 0;
            double g = 0;
            double b = 0;
            if ((lambda >= 380.0) && (lambda < 440.0))
            {
                r = -1.0 * (lambda - 440.0) / (440.0 - 380.0);
                g = 0.0;
                b = 1.0;
            }

            else if ((lambda >= 440.0) && (lambda < 490.0))
            {
                r = 0.0;
                g = (lambda - 440.0) / (490.0 - 440.0);
                b = 1.0;
            }
            else if ((lambda >= 490.0) && (lambda < 510.0))
            {

                r = 0.0;
                g = 1.0;
                b = -1.0 * (lambda - 510.0) / (510.0 - 490.0);
            }
            else if ((lambda >= 510.0) && (lambda < 580.0))
            {
                r = (lambda - 510.0) / (580.0 - 510.0);
                g = 1.0;
                b = 0.0;
            }

            else if ((lambda >= 580.0) && (lambda < 645.0))
            {
                r = 1.0;
                g = -1.0 * (lambda - 645.0) / (645.0 - 580.0);
                b = 0.0;
            }
            else if ((lambda >= 645.0) && (lambda <= 780.0))
            {

                r = 1.0;
                g = 0.0;
                b = 0.0;
            }
            if ((lambda >= 380.0) && (lambda < 420.0))
            {
                double attenuation = 0.3 + 0.7 * (lambda - 380) / (420 - 380);
                r = r * attenuation;
                g = 0.0;
                b = 1.0 * attenuation;
            }
            else if ((lambda >= 701.0) && (lambda < 780.0))
            {
                double attenuation = 0.30 + 0.70 * (780.0 - lambda) / (780.0 - 700.0);
                r = r * attenuation;
                g = 0.0;
                b = 0.0;
            }
            if (lambda < 380)
            {//紫外
                r = 1;
                g = 1;
                b = 1;
            }
            else if (lambda > 780)
            {//红外
                r = 1;
                g = 0;
                b = 0;
            }
            int R = (int)(r * 255);
            int G = (int)(g * 255);
            int B = (int)(b * 255);
            return Color.FromArgb(R, G, B);//颜色
        }
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效果：