def METHOD_NAME(self) -> Tuple[np.ndarray]:
    rgb = []
    if not self.open_grid:
        for b in self.show_band:
            rgb.append(self.src_data.read(b))
        geotf = self.geoinfo.geotf
    else:
        for b in self.show_band:
            rgb.append(
                get_thumbnail(self.src_data.read(b), self.thumbnail_min))
        geotf = None
    ima = np.stack(rgb, axis=2)  # cv2.merge(rgb)
    if self.geoinfo["dtype"] != "uint8":
        ima = sample_norm(ima)
    return two_percentLinear(ima), geotf