import media

def get_picture():
    '''Let the user select a picture file, display that picture, then return it'''
    
    filename = media.choose_file()
    pic = media.load_picture(filename)
    media.show(pic)
    return pic
    
def make_sunset(pic):
    '''Make the picture pic look like it was taken at sunset, then display that picture'''

    # Reduce the blue and green by 30% each to make
    # the red stand out.
    for pixel in pic:
        green = media.get_green(pixel) 
        media.set_green(pixel, int(green * 0.7)) 

        blue = media.get_blue(pixel) 
        media.set_blue(pixel, int(blue * 0.7))
    media.show(pic)
    
if __name__ == '__main__':
    pic = get_picture()
    make_sunset(pic)