n class="sd">        :htype: </span>
<span class="sd">            | &#39;deg&#39; or &#39;rad&#39;, optional</span>
<span class="sd">            |   - &#39;deg&#39;: hue angle between 0° and 360°</span>
<span class="sd">            |   - &#39;rad&#39;: hue angle between 0 and 2pi radians</span>
<span class="sd">    </span>
<span class="sd">    Returns:</span>
<span class="sd">        :returns:</span>
<span class="sd">            | ndarray of deltaH values.</span>
<span class="sd">    &quot;&quot;&quot;</s