="op">(</span><span class="va">img</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="co"># Image with four objects with a known resolution of 300 dpi</span></span></span>
<span class="r-in"><span><span class="co"># Higher square: 10 x 10 cm</span></span></span>
<span class="r-in"><span><span class="co"># Lower square: 5 x 5 cm</span></span></span>
<span class="r-in"><span><span class="co"># Rectangle: 4 x 2 cm</span></span></span>
<span class="r-in"><span><span class="co">#