title: How do you use srgbClr in openpyxl ColorChoices
body: <p>How can I use colors that are not represented by the colornames like RGB.
  Sorry, I don't understand the documents but there are no examples. Here is my code:</p>
  
  <pre><code>series4Total = chart1.series[3]
  fill4Total =  PatternFillProperties(prst="pct5")
  fill4Total.foreground = ColorChoice(srgbClr='30,144,255') # dodgerBlue: R:30 G: 144 B: 255
  fill4Total.background = ColorChoice(srgbClr='30,144,255')
  series4Total.graphicalProperties.pattFill = fill4Total
  </code></pre>