title: Application/script for merging images, applying color, black & white filter in batch?
body: <p>I'm making achievements for my game, and I would like to make an automated process to save a lot of time instead of doing it manually. (I'm using Windows)</p>
  <p>The <strong>inputs</strong> of this process would be</p>
  <ul>
  <li><p><strong>one</strong> rectangular opaque background image (i.e. 200x200 PNG)</p>
  </li>
  <li><p>Color A, (i.e. in hex)</p>
  </li>
  <li><p>Color B, (i.e. in hex)</p>
  </li>
  <li><p>and <strong>multiple</strong> same sized, rectangular, transparent foreground images. (i.e. 200x200 PNG)</p>
  </li>
  </ul>
  <p>And the <strong>process</strong> would do this for <strong>every foreground image</strong>:</p>
  <ol>
  <li><p><strong>Start with the background</strong> image.</p>
  </li>
  <li><p>Merge the foreground image with <strong>Color A filter</strong> applied, and also with <strong>an offset from the middle</strong>.</p>
  </li>
  <li><p>Merge the foreground image with <strong>Color B filter</strong> applied, in the <strong>middle</strong>.</p>
  </li>
  <li><p><strong>Save the result in a file</strong>.</p>
  </li>
  <li><p>Apply a <strong>black &amp; white filter</strong> and <strong>save the result in a file</strong>.</p>
  </li>
  </ol>
  <p>So the output would be for example multiple 200x200 PNG images, each of it having a colored and a black &amp; white version</p>
  <p>I think there must be an <strong>application</strong> capable of this.</p>
  <p>But if not, is there a way to quickly do this in some <strong>programming/script language</strong> for example in Python?</p>