title: How does transparency in rgba work?
body: <p>I have recently learned about rgba for setting colours in css. I am curious about the technical aspect of the transparency channel actually works.</p>
  
  <p>For example, if I set the values to be rgba(15, 34, 160, 1) and rgba(15 34, 160, 0.5) for two separate headers, then they are referred to as having the same colour, but having a different opacity value. What I am wondering is whether or not these colours are actually the same. By this I mean that in terms of the light coming out the pixels, they must surely be different in order to create two different looks of headers. Does this mean that the alpha value is actually used to change the colour in some sort of specific way?</p>
  
  <p>Cheers!</p>