generate_preview method Leave feedback

def generate_preview(self, preview_options):
    ...

import os
import groupdocs.watermark as gw
import groupdocs.watermark.options as gwo

output_directory = os.path.join(os.getcwd(), "preview")
os.makedirs(output_directory, exist_ok=True)

def create_page_stream(number: int):
    path = os.path.join(output_directory, f"page{number}.png")
    return open(path, "wb")

def release_page_stream(number: int, stream):
    stream.close()

with gw.Watermarker("sample.pdf") as watermarker:
    preview_options = gwo.PreviewOptions(create_page_stream, release_page_stream)
    preview_options.preview_format = gwo.PreviewOptions.PreviewFormats.PNG
    preview_options.page_numbers = [1, 2]
    watermarker.generate_preview(preview_options)