test_results_510/index.html">Perceptual hash</a></td>
    <td>map visually identical images to the same or similar hash-- useful in image retrieval, authentication, indexing, or copy detection as well as digital watermarking.</td>
  </tr>
  <tr>
    <td><a href="https://usage.imagemagick.org/blur/">Special effects</a></td>
    <td>blur, sharpen, threshold, or tint an image.</td>
  </tr>
  <tr>
    <td><a href="https://usage.imagemagick.org/text/">Text &amp; comments</a></td>
    <td>insert descriptive or ar