LED Lichtmischung?

[Mavarik]

hab das was gefunden...

Code:

void hsi2rgbw(float H, float S, float I, int* rgbw) {
  int r, g, b, w;
  float cos_h, cos_1047_h;
  H = fmod(H,360); // cycle H around to 0-360 degrees
  H = 3.14159*H/(float)180; // Convert to radians.
  S = S>0?(S<1?S:1):0; // clamp S and I to interval [0,1]
  I = I>0?(I<1?I:1):0;
  
  if(H < 2.09439) {
    cos_h = cos(H);
    cos_1047_h = cos(1.047196667-H);
    r = S*255*I/3*(1+cos_h/cos_1047_h);
    g = S*255*I/3*(1+(1-cos_h/cos_1047_h));
    b = 0;
    w = 255*(1-S)*I;
  } else if(H < 4.188787) {
    H = H - 2.09439;
    cos_h = cos(H);
    cos_1047_h = cos(1.047196667-H);
    g = S*255*I/3*(1+cos_h/cos_1047_h);
    b = S*255*I/3*(1+(1-cos_h/cos_1047_h));
    r = 0;
    w = 255*(1-S)*I;
  } else {
    H = H - 4.188787;
    cos_h = cos(H);
    cos_1047_h = cos(1.047196667-H);
    b = S*255*I/3*(1+cos_h/cos_1047_h);
    r = S*255*I/3*(1+(1-cos_h/cos_1047_h));
    g = 0;
    w = 255*(1-S)*I;
  }
  
  rgbw[0]=r;
  rgbw[1]=g;
  rgbw[2]=b;
  rgbw[3]=w;

Muss ich mal testen...