def two_tone(image: color1, color2) -> image:
    """ The function calculates the average of red, green, blue components of the images
    to determine its pixels brightness. If the average of the components brightness are from
    0 to 127 it sets to color1, but if the average components are between 128 to 255
    the color sets to color2.
    """
    if color1 == "gray":
        color_chosen1 = create_color(128, 128, 128)
    if color2 == "cyan":
        color_chosen2 = create_color(0, 255, 255)

    for pixel in original_image:
        x, y, (r, g, b) = pixel

    if ((r, g, b) / 3 <= 127):
        set_color(two_tone_image, x, y, color_chosen1(r, g, b))
    elif ((r, g, b) / 3 >= 127):
        set_color(two_tone_image, x, y, color_chosen2(r, g, b))