def get_crop_specs(proposal, classifier):
    """Converts a crater proposal into cropping function
    arguments.
    """
    lat = proposal[0]
    long = proposal[1]
    px = classifier.crater_pixels
    dim = classifier.input_dims
    r_im = proposal[2] * min(dim) / (2 * px)
    upper = lat - r_im
    left = long - r_im
    return (round(upper), round(left)), (round(2 * r_im), round(2 * r_im))
