#include <stdio.h> #include <math.h> double get_blend_color(double a, double b, double opacity) { a = pow(a, 2.2); b = pow(b, 2.2); double result = a * opacity + b * (1 - opacity); result = pow(result, 1/2.2); return result; } int main() { printf("%f\n", get_blend_color(1,0,0.5)); return 0; }