def rgb_to_xyz(red, green, blue):
    """
    Convert standard RGB color to XYZ color.

    :arg int red: RGB value of Red.
    :arg int green: RGB value of Green.
    :arg int blue: RGB value of Blue.
    :returns: Tuple (X, Y, Z) representing XYZ color
    :rtype: tuple

    D65/2° standard illuminant
    """
    rgb = []
    for val in (red, green, blue):
        val /= 255.0
        if val > 0.04045:
            val = pow((val + 0.055) / 1.055, 2.4)
        else:
            val /= 12.92
        val *= 100
        rgb.append(val)
    red, green, blue = rgb
    x_val = red * 0.4124 + green * 0.3576 + blue * 0.1805
    y_val = red * 0.2126 + green * 0.7152 + blue * 0.0722
    z_val = red * 0.0193 + green * 0.1192 + blue * 0.9505
    return x_val, y_val, z_val
