//指定波長轉換成RGBA顏色 std::vector<int> lambdaToColor(double lambda,double gamma = 0.8,double intensityMax = 255.0) {double r, g, b, alpha;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;}else {r = 0.0;g = 0.0;b = 0.0;}//在可見光譜的邊緣處強度較低。if (lambda >= 380.0 && lambda < 420.0) {alpha = 0.30 + 0.70 * (lambda - 380.0) / (420.0 - 380.0);}else if (lambda >= 420.0 && lambda < 701.0) {alpha = 1.0;}else if (lambda >= 701.0 && lambda < 780.0) {alpha = 0.30 + 0.70 * (780.0 - lambda) / (780.0 - 700.0);}else {alpha = 0.0;}//1953年在引入NTSC電視時,計算具有熒光體的監視器的亮度公式如下int Y = static_cast<int>(0.212671*r + 0.715160*g + 0.072169*b);//伽馬射線 gamma//照明強度 intensityMaxint R = r == 0.0 ? 0 : static_cast<int>(std::round(intensityMax * std::pow(r * alpha, gamma)));int G = g == 0.0 ? 0 : static_cast<int>(std::round(intensityMax * std::pow(g * alpha, gamma)));int B = b == 0.0 ? 0 : static_cast<int>(std::round(intensityMax * std::pow(b * alpha, gamma)));int A = static_cast<int>(alpha);return std::vector<int>{R, G, B, A, Y}; }

轉載于:https://www.cnblogs.com/cheungxiongwei/p/9181456.html

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