RGB to HSL conversion

Question

I\'m creating a Color Picker tool and for the HSL slider, I need to be able to convert RGB to HSL. When I searched SO for a way to do the conversion, I found this question H

Answer 1

This page provides a function for conversion between color spaces, including RGB to HSL.

function RGBToHSL(r,g,b) {
  // Make r, g, and b fractions of 1
  r /= 255;
  g /= 255;
  b /= 255;

  // Find greatest and smallest channel values
  let cmin = Math.min(r,g,b),
      cmax = Math.max(r,g,b),
      delta = cmax - cmin,
      h = 0,
      s = 0,
      l = 0;

  // Calculate hue
  // No difference
  if (delta == 0)
    h = 0;
  // Red is max
  else if (cmax == r)
    h = ((g - b) / delta) % 6;
  // Green is max
  else if (cmax == g)
    h = (b - r) / delta + 2;
  // Blue is max
  else
    h = (r - g) / delta + 4;

  h = Math.round(h * 60);

  // Make negative hues positive behind 360°
  if (h < 0)
      h += 360;

  // Calculate lightness
  l = (cmax + cmin) / 2;

  // Calculate saturation
  s = delta == 0 ? 0 : delta / (1 - Math.abs(2 * l - 1));

  // Multiply l and s by 100
  s = +(s * 100).toFixed(1);
  l = +(l * 100).toFixed(1);

  return "hsl(" + h + "," + s + "%," + l + "%)";
}