CSS를 사용하여 마우스 오버 시 색상 복원으로 그레이스케일을 달성하는 방법은 무엇입니까?

<code class="css">img.grayscale {
  filter: url("data:image/svg+xml;utf8, ..."); /* Firefox 3.5+ */
  filter: gray; /* IE6-9 */
  -webkit-filter: grayscale(100%); /* Chrome 19+, Safari 6+ */
}

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

<code class="css">img {
  transition: all .6s ease;
}

img:hover {
  opacity: 0;
}

.grayscale {
  opacity: 1;
}</code>

<code class="html"><img class="grayscale" src="grayscale_image.jpg">
<img class="colored" src="colored_image.jpg"></code>

<code class="css">svg image {
  transition: all .6s ease;
}

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

<code class="xml"><svg ...>
  <defs>
    <filter id="filtersPicture">
      <feColorMatrix type="saturate" values="0" />
    </filter>
  </defs>
  <image filter="url(#filtersPicture)" ... />
</svg></code>