rgb to color tone

rgb2Tone.h

uint8_t rgb2H(uint8_t red, uint8_t green, uint8_t blue){
  float r = red/255. , g=green/255. , b=blue/255.;
  float cMax = max(max(r, g), b);
  float cMin = min(min(r, g), b);
  float delta = cMax - cMin;

  float h = 0;
  if(delta > 0) {
    if(cMax == r) {
      h = 60 * (fmod(((g - b) / delta), 6));
    } else if(cMax == g) {
      h = 60 * (((b - r) / delta) + 2);
    } else if(cMax == b) {
      h = 60 * (((r - g) / delta) + 4);
    }
    if(h < 0) {
      h = 360 + h;
    }
  }
  return (uint8_t)h;
}