code: public void setNonStrokingColor (final int r, final int g, final int b) throws IOException
    {
      if (_isOutside255Interval (r) || _isOutside255Interval (g) || _isOutside255Interval (b))
      {
        throw new IllegalArgumentException ("Parameters must be within 0..255, but are (" + r + "," + g + "," + b + ")");
      }
      writeOperand (r / 255f);
      writeOperand (g / 255f);
      writeOperand (b / 255f);
      writeOperator ((byte) 'r', (byte) 'g');
    }
docs: Set the non-stroking color in the DeviceRGB color space. Range is 0..255.
  
  @param r
  The red value.
  @param g
  The green value.
  @param b
  The blue value.
  @throws IOException
  If an IO error occurs while writing to the stream.
  @throws IllegalArgumentException
  If the parameters are invalid.