Python에서 기본 해상도 및 형식으로 PDF 문서에서 이미지를 추출하는 방법은 무엇입니까?

<code class="python">import fitz

# Open the PDF document
doc = fitz.open("file.pdf")

# Iterate through pages and images
for i in range(len(doc)):
    for img in doc.getPageImageList(i):
        xref = img[0]

        # Convert picture object to PNG
        pix = fitz.Pixmap(doc, xref)
        if pix.n < 5:  # grayscale or RGB
            pix.writePNG("p%s-%s.png" % (i, xref))
        else:  # CMYK
            pix1 = fitz.Pixmap(fitz.csRGB, pix)
            pix1.writePNG("p%s-%s.png" % (i, xref))
            pix1 = None</code>

<code class="python">import os
import fitz
from tqdm import tqdm

# Set working directory
workdir = "your_folder"

# Process PDF files in the directory
for each_path in os.listdir(workdir):
    if ".pdf" in each_path:
        # Open the PDF document
        doc = fitz.Document((os.path.join(workdir, each_path)))

        # Iterate through pages and images
        for i in tqdm(range(len(doc)), desc="pages"):
            for img in tqdm(doc.get_page_images(i), desc="page_images"):
                xref = img[0]

                # Extract the image and save it as PNG
                image = doc.extract_image(xref)
                pix = fitz.Pixmap(doc, xref)
                pix.save(os.path.join(workdir, "%s_p%s-%s.png" % (each_path[:-4], i, xref)))

# Print a completion message
print("Done!")</code>