import image
import sys

sys.argv = ['_', '100']

def red_color_spectrum(red):
    """Returns a 256 by 256 image matrix with pixels representing all possible
    24-bit rgb colors (8 bits each for r, g, and b) with the indicated amount of
    red (0 to 255).
    """
    matrix = []
    for y in range(256):
        row = []
        for x in range(256):
            pixel = (red, x, y)
            row.append(pixel)
        matrix.append(row)
    return matrix

def main():
    red = int(sys.argv[1])
    m = red_color_spectrum(red)
    im = image.new(m)
    im.show()

if __name__ == '__main__':
    main()