function _getBackgroundColourOption (value) {
  if (is.object(value) || is.string(value)) {
    const colour = color(value);
    return [
      colour.red(),
      colour.green(),
      colour.blue(),
      Math.round(colour.alpha() * 255)
    ];
  } else {
    throw is.invalidParameterError('background', 'object or string', value);
  }
}
Create a RGBA colour array from a given value.
@private
@param {string|Object} value
@throws {Error} Invalid value