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<meta property="og:description" content="Applies alpha (or opacity) to a color in hexadecimal form by
converting opacity in the [0, 1] range to hex in the [0, 255] range
and appending to the hex color." />
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    <div class="page-header">
    <h1>Add alpha to hex color</h1>
    <small class="dont-index">Source: <a href='https://github.com/gadenbuie/xaringanthemer/blob/master/R/color.R'><code>R/color.R</code></a></small>
    <div class="hidden name"><code>apply_alpha.Rd</code></div>
    </div>

    <div class="ref-description">
    <p>Applies alpha (or opacity) to a color in hexadecimal form by
converting opacity in the <code>[0, 1]</code> range to hex in the <code>[0, 255]</code> range
and appending to the hex color.</p>
    </div>

    <pre class="usage"><span class='fu'>apply_alpha</span><span class='op'>(</span><span class='va'>color_hex</span>, opacity <span class='op'>=</span> <span class='fl'>0.5</span><span class='op'>)</span></pre>

    <h2 class="hasAnchor" id="arguments"><a class="anchor" href="#arguments"></a>Arguments</h2>
    <table class="ref-arguments">
    <colgroup><col class="name" /><col class="desc" /></colgroup>
    <tr>
      <th>color_hex</th>
      <td><p>A character string representing a hex color</p></td>
    </tr>
    <tr>
      <th>opacity</th>
      <td><p>Desired opacity of the output color</p></td>
    </tr>
    </table>

    <h2 class="hasAnchor" id="value"><a class="anchor" href="#value"></a>Value</h2>

    <p>A character string with added opacity level as hexadecimal characters.</p>

    <h2 class="hasAnchor" id="examples"><a class="anchor" href="#examples"></a>Examples</h2>
    <pre class="examples"><span class='r-in'><span class='va'>blue</span> <span class='op'>&lt;-</span> <span class='st'>"#0e6ba8"</span></span>
<span class='r-in'><span class='va'>blue_transparent</span> <span class='op'>&lt;-</span> <span class='fu'>apply_alpha</span><span class='op'>(</span><span class='va'>blue</span><span class='op'>)</span></span>
<span class='r-in'></span>
<span class='r-in'><span class='kw'>if</span> <span class='op'>(</span><span class='fu'><a href='https://rdrr.io/r/base/ns-load.html'>requireNamespace</a></span><span class='op'>(</span><span class='st'>"scales"</span>, quietly <span class='op'>=</span> <span class='cn'>TRUE</span><span class='op'>)</span><span class='op'>)</span> <span class='op'>{</span></span>
<span class='r-in'>  <span class='fu'>scales</span><span class='fu'>::</span><span class='fu'><a href='https://scales.r-lib.org/reference/show_col.html'>show_col</a></span><span class='op'>(</span><span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span><span class='op'>(</span><span class='va'>blue</span>, <span class='va'>blue_transparent</span><span class='op'>)</span><span class='op'>)</span></span>
<span class='r-in'><span class='op'>}</span></span>
<span class='r-plt img'><img src='apply_alpha-1.png' alt='' width='700' height='433' /></span>
<span class='r-in'></span>
</pre>
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