Scale the image to uint8

    Parameters:
    -----------
    im: 2d array
        The image

    Returns:
    --------
    im: 2d array (dtype uint8)
        The scaled image to uint8

def uint8sc(im):
    """Scale the image to uint8

    Parameters:
    -----------
    im: 2d array
        The image

    Returns:
    --------
    im: 2d array (dtype uint8)
        The scaled image to uint8
    """
    im = np.asarray(im)
    immin = im.min()
    immax = im.max()
    imrange = immax - immin
    return cv2.convertScaleAbs(im - immin, alpha=255 / imrange)