title: ImageMagick batch convert all PNGs in subdirectories to JPEGs
body: <p>I have a folder with a number of sub folders in it which contain the images I want to convert from PNG to JPEG.</p>
  
  <p>I have tried:</p>
  
  <pre><code>cd d:\images
  
  mogrify -format jpg \*\*.png
  </code></pre>
  
  <p>I tried slashes in both directions (I'm using Windows 7).</p>
  
  <p>But I just get <code>invalid argument</code> errors.</p>
  
  <p>What should I do?</p>
  
  <p>I'd really most value a simple example answer rather than a link to a 50 page image ImageMagick documentation if possible (I'm a newbie).</p>