title: PDFlib use transparent colors
body: <p>I have a table and I want to give it a background color with light transparency. I know we have the option &quot;fillcolor&quot; but there we can only use something like rgb (means no use of rgba) and color codes which looks like this: <code>fillcolor={rgba 0.9 0.5 0}</code> or <code>fillcolor={#ffed00}</code>.</p>
  <p>So how can I make the background more transparent?</p>