所以我试图弄清楚如何计算颜色由HSL值表示的多个对象的平均色调.值得庆幸的是,我偶然发现了
this Stack Overflow post,并开始实现顶部答案中提供的算法(我在C中工作).
不幸的是,我的实现似乎不起作用.在这里,它是完整的;请注意,虽然我写了“Hue”,但我按照初始实现使用角度(以度为单位)(从0-360角度切换到0-256色调,一旦我知道我的代码有效,就不应该很难).
- #include <iostream>
- #include <vector>
- #include <cmath>
- #define PI (4*atan(1))
- int main()
- {
- ///
- /// Calculations adapted from this source:
- /// https://stackoverflow.com/questions/8169654/how-to-calculate-mean-and-standard-deviation-for-hue-values-from-0-to-360
- std::vector<double> Hues = {355,5,5};
- //These will be used to store the sum of the angles
- double X = 0.0;
- double Y = 0.0;
- //Loop through all H values
- for (int hue = 0; hue < Hues.size(); ++hue)
- {
- //Add the X and Y values to the sum X and Y
- X += cos(Hues[hue] / 180 * PI);
- Y += sin(Hues[hue] / 180 * PI);
- }
- //Now average the X and Y values
- X /= Hues.size();
- Y /= Hues.size();
- //Get atan2 of those
- double AverageColor = atan2(X,Y) * 180 / PI;
- std::cout << "Average: " << AverageColor << "\n";
- return 0;
- }
而不是3的预期答案(因为355在这个方案中应该相当于-5),我得到86.9951.
有人可以指出我做错了什么吗？这看起来非常基本.
