Returns Gaussian smoothed image.

    :param image: numpy array or :class:`jicimagelib.image.Image`
    :param sigma: standard deviation
    :returns: :class:`jicimagelib.image.Image`

def smooth_gaussian(image, sigma=1):
    """Returns Gaussian smoothed image.

    :param image: numpy array or :class:`jicimagelib.image.Image`
    :param sigma: standard deviation
    :returns: :class:`jicimagelib.image.Image`
    """
    return scipy.ndimage.filters.gaussian_filter(image, sigma=sigma, mode="nearest")