How to Create a Grayscale Image That Re-Colors on Mouseover Using CSS?

CSS Grayscaling with Mouseover Re-Coloration

Query:

Create an image that is initially grayscale, but switches to color when the mouse hovers over it. Implement this using IE and Firefox compatible CSS techniques.

Solutions:

Pure CSS (Using Single Colored Image):

This method utilizes CSS filters to achieve the grayscale effect and removes the filter on hover to reveal the original color:

<code class="css">img.grayscale {
  filter: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg'><filter id='grayscale'><feColorMatrix type='matrix' values='0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0'/></filter></svg>#grayscale"); /* Firefox 3.5+ */
  filter: gray; /* IE6-9 */
  -webkit-filter: grayscale(100%); /* Chrome 19+ &amp; Safari 6+ */
}

img.grayscale:hover {
  filter: none;
  -webkit-filter: grayscale(0%);
}</code>

Inline SVG with CSS Transitions:

This approach embeds an SVG element with an image and applies CSS transitions to fade between grayscale and color on hover:

<code class="css">img.grayscale {
  filter: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg'><filter id='grayscale'><feColorMatrix type='matrix' values='0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0'/></filter></svg>#grayscale");
  filter: gray;
  -webkit-filter: grayscale(100%);
  -webkit-transition: all .6s ease;
  -webkit-backface-visibility: hidden;
}

img.grayscale:hover {
  filter: none;
  -webkit-filter: grayscale(0%);
}

svg {
  background: url(https://image-source.jpg);
}

svg image {
  transition: all .6s ease;
}

svg image:hover {
  opacity: 0;
}</code>

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