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  <main id="main" class="col-md-9"><div class="page-header">
      <img src="../logo.png" class="logo" alt=""><h1>Converts an R color to RGB (red/green/blue) including a transparency (alpha channel).</h1>
      <small class="dont-index">Source: <a href="https://github.com/fishR-Core-Team/FSA/blob/HEAD/R/FSAUtils.R" class="external-link"><code>R/FSAUtils.R</code></a></small>
      <div class="d-none name"><code>col2rgbt.Rd</code></div>
    </div>

    <div class="ref-description section level2">
    <p>Converts an R color to RGB (red/green/blue) including a transparency (alpha channel). Similar to <code><a href="https://rdrr.io/r/grDevices/col2rgb.html" class="external-link">col2rgb</a></code> except that a transparency (alpha channel) can be included.</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">col2rgbt</span><span class="op">(</span><span class="va">col</span>, transp <span class="op">=</span> <span class="fl">1</span><span class="op">)</span></span></code></pre></div>
    </div>

    <div class="section level2">
    <h2 id="arguments">Arguments<a class="anchor" aria-label="anchor" href="#arguments"></a></h2>
    <dl><dt>col</dt>
<dd><p>A vector of any of the three kinds of R color specifications (i.e., either a color name (as listed by <code><a href="https://rdrr.io/r/grDevices/colors.html" class="external-link">colors</a></code>()), a hexadecimal string of the form "#rrggbb" or "#rrggbbaa" (see <code><a href="https://rdrr.io/r/grDevices/rgb.html" class="external-link">rgb</a></code>), or a positive integer i meaning <code><a href="https://rdrr.io/r/grDevices/palette.html" class="external-link">palette</a></code>()[i].</p></dd>


<dt>transp</dt>
<dd><p>A numeric vector that indicates the transparency level for the color. The transparency values must be greater than 0. Transparency values greater than 1 are interpreted as the number of points plotted on top of each other before the transparency is lost and is, thus, transformed to the inverse of the transparency value provided.</p></dd>

</dl></div>
    <div class="section level2">
    <h2 id="value">Value<a class="anchor" aria-label="anchor" href="#value"></a></h2>
    

<p>A vector of hexadecimal strings of the form "#rrggbbaa" as would be returned by <code><a href="https://rdrr.io/r/grDevices/rgb.html" class="external-link">rgb</a></code>.</p>
    </div>
    <div class="section level2">
    <h2 id="see-also">See also<a class="anchor" aria-label="anchor" href="#see-also"></a></h2>
    <div class="dont-index"><p>See <code><a href="https://rdrr.io/r/grDevices/col2rgb.html" class="external-link">col2rgb</a></code> for similar functionality.</p></div>
    </div>
    <div class="section level2">
    <h2 id="author">Author<a class="anchor" aria-label="anchor" href="#author"></a></h2>
    <p>Derek H. Ogle, <a href="mailto:DerekOgle51@gmail.com">DerekOgle51@gmail.com</a></p>
    </div>

    <div class="section level2">
    <h2 id="ref-examples">Examples<a class="anchor" aria-label="anchor" href="#ref-examples"></a></h2>
    <div class="sourceCode"><pre class="sourceCode r"><code><span class="r-in"><span><span class="fu">col2rgbt</span><span class="op">(</span><span class="st">"black"</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1] "#000000FF"</span>
<span class="r-in"><span><span class="fu">col2rgbt</span><span class="op">(</span><span class="st">"black"</span>,<span class="fl">1</span><span class="op">/</span><span class="fl">4</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1] "#00000040"</span>
<span class="r-in"><span><span class="va">clrs</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="st">"black"</span>,<span class="st">"blue"</span>,<span class="st">"red"</span>,<span class="st">"green"</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="fu">col2rgbt</span><span class="op">(</span><span class="va">clrs</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1] "#000000FF" "#0000FFFF" "#FF0000FF" "#00FF00FF"</span>
<span class="r-in"><span><span class="fu">col2rgbt</span><span class="op">(</span><span class="va">clrs</span>,<span class="fl">1</span><span class="op">/</span><span class="fl">4</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1] "#00000040" "#0000FF40" "#FF000040" "#00FF0040"</span>
<span class="r-in"><span><span class="va">trans</span> <span class="op">&lt;-</span> <span class="op">(</span><span class="fl">1</span><span class="op">:</span><span class="fl">4</span><span class="op">)</span><span class="op">/</span><span class="fl">5</span></span></span>
<span class="r-in"><span><span class="fu">col2rgbt</span><span class="op">(</span><span class="va">clrs</span>,<span class="va">trans</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1] "#00000033" "#0000FF66" "#FF000099" "#00FF00CC"</span>
<span class="r-in"><span></span></span>
</code></pre></div>
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