file_path = '../my_image.ppm'
settings = []
data = []

with open(file_path) as f:
    for line in f:
        hash_position = line.find('#')
        if hash_position == 0 or not line:
            continue
        elif hash_position > 0:
            line = line[:hash_position]
        splitted_line = line.split()

        if len(settings) < 4:
            length_diff = len(splitted_line) + len(settings) - 4
            if length_diff > 0 and settings:
                data.extend(list(map(int, splitted_line[-length_diff:])))
                settings.extend(splitted_line[:-1])
            else:
                settings.extend(splitted_line)
        else:
            data.extend(list(map(int, splitted_line)))