Hexadecimal colour to RGBA

hex2rgba.js

// Convert hex colour to rgba
// ---------------------------------
// hex: hex colour without leading #
// opacity: integer from 0 to 1

function hex2rgba(hex, opacity) {
  var r = parseInt(hex.substring(0, 2), 16),
      g = parseInt(hex.substring(2, 4), 16),
      b = parseInt(hex.substring(4, 6), 16);

  return 'rgba(' + r + ', ' + g + ', ' + b + ', ' + opacity + ')';
}