from typing import Tuple


def default_colors(category_name: str) -> Tuple[int, int, int]:
    """
    Maps a category name to an rgb color (without fading).
    :param category_name: Name of object category for the annotation.
    :return: Tuple representing rgb color.
    """

    if 'vehicle' in category_name:
        return 255, 255, 0  # yellow
    elif 'object' in category_name:
        return 204, 0, 204  # violet
    elif 'human' in category_name or 'animal' in category_name:
        return 255, 153, 51  # orange
    else:
        raise ValueError(f"Cannot map {category_name} to a color.")