from typing import List


def is_image(file_name: str, ext_list_image: List[str]) -> bool:
    """Determine if file is image based on known file name extensions."""
    ext_list_lower = [ext.lower() for ext in ext_list_image]
    fn_lower = file_name.lower()
    is_image = fn_lower.endswith(tuple(ext_list_lower))
    return is_image