te users to photograph the object together
with a scale (e.g., ruler, micrometer...).</p>
    </div>

    <div class="section level2">
    <h2 id="ref-usage">Usage<a class="anchor" aria-label="anchor" href="#ref-usage"></a></h2>
    <div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">calibrate</span><span class="op">(</span><span class="va">img</span>, viewer <span class="op">=</span> <span class="fu"><a href="get_pliman_viewer.html">get_pliman_viewer</a></span><span class="op">(<