Brightness thing

makeBrighter.js

function rgb2hsv(r,g,b) {
  let v=Math.max(r,g,b), c=v-Math.min(r,g,b);
  let h= c && ((v==r) ? (g-b)/c : ((v==g) ? 2+(b-r)/c : 4+(r-g)/c)); 
  return [60*(h<0?h+6:h), v&&c/v, v];
}

function hsv2rgb(h,s,v) {                              
  let f= (n,k=(n+h/60)%6) => v - v*s*Math.max( Math.min(k,4-k,1), 0);     
  return [f(5),f(3),f(1)];       
}

const makeBrighter = (r, g, b) => {
    const hsvConversion = rgb2hsv(r, g, b);
    if (hsvConversion[2] <= 80) {
        return hsv2rgb(hsvConversion[0], hsvConversion[1], hsvConversion[2] + 100);
    }
    if (hsvConversion[2] <= 125) {
        return hsv2rgb(hsvConversion[0], hsvConversion[1], hsvConversion[2] + 50);
    }
    return [r, g, b];
}