Fonction CSS saturate()

filter: saturate(1);

filter: saturate(4);

filter: saturate(50%);

filter: saturate(0);

<section id="default-example">
  <img
    class="transition-all"
    id="example-element"
    src="/shared-assets/images/examples/firefox-logo.svg"
    width="200" />
</section>

saturate(amount)

saturate(0);    /* Compltement sous-sature */
saturate(.4);   /* Sous-sature  40% */
saturate()      /* Aucun effet */
saturate(100%);
saturate(200%); /* Saturation double */

<div>
  <p>Avec <code>saturate()</code></p>
  <div id="saturate"></div>
</div>
<div>
  <p>Avec <code>hsl()</code></p>
  <div id="hsl"></div>
</div>

#saturate,
#hsl {
  display: flex;
  margin: 1em 0;
}

#saturate div,
#hsl div {
  width: 2px;
  height: 100px;
}

const saturate = document.getElementById("saturate");
const hsl = document.getElementById("hsl");

for (let i = 0; i <= 200; i++) {
  const div1 = document.createElement("div");
  div1.style.backgroundColor = `hsl(0 ${i / 2}% 50%)`;
  hsl.appendChild(div1);

  const div2 = document.createElement("div");
  div2.style.backgroundColor = "hsl(0 50% 50%)";
  div2.style.filter = `saturate(${i}%)`;
  saturate.appendChild(div2);
}