使用PIL将多张JPEG转PDF时a.jpg重复保存的问题求助

Hey there! Let's sort out that annoying duplicate a.jpg in your generated PDF. Here's what's going wrong and how to fix it:

What's Causing the Duplicate? #

When you call img1.save() with save_all=True and pass append_images=[img1, img2], PIL does two things:

1. It saves img1 as the first page of the PDF.
2. Then it appends every image in the append_images list—so that's img1 again (second page) and img2 (third page).

That's why you end up with two copies of a.jpg instead of one!

The Fix #

We just need to make sure we don't include img1 twice. Instead of passing the full images list to append_images, we'll only pass the images after the first one (so just img2).

Corrected Code #

I also fixed a couple of small bugs in your original code (missing import, typo in resolution) to make it work properly:

import random
from PIL import Image  # Don't forget this import!

def print_hi(name):
    folder = "C:/Users/arjay/Documents/IntellijBackgrounds/"
    img1 = Image.open(folder + "a.jpg")
    img2 = Image.open(folder + "b.jpg")
    
    # Generate random PDF filename
    random_pdf_name = folder
    for _ in range(5):
        # Add random uppercase letter
        random_pdf_name += chr(random.randint(65, 90))
    # Add random number and file extension
    random_pdf_name += str(random.randint(1, 1000)) + ".pdf"
    
    images = [img1, img2]
    if len(images) > 1:
        # Save img1 as first page, append ONLY the remaining images
        img1.save(
            random_pdf_name,
            "pdf",
            resolution=100.0,
            save_all=True,
            append_images=images[1:]  # This is the key fix!
        )
    else:
        img1.save(random_pdf_name, "pdf", resolution=100.0, save_all=True)
    
    print("Successfully converted images to", random_pdf_name)

if __name__ == '__main__':
    print_hi('PyCharm')

Key Changes Explained #

• append_images=images[1:]: This slices the list to only include images starting from index 1 (so just img2), preventing img1 from being added twice.
• Added from PIL import Image: Your original code was missing this, which would have thrown a NameError.
• Fixed the typo reolution → resolution: That would have caused PIL to ignore your resolution setting.
• Cleaned up the random filename generation to remove redundant variable assignments.

Alternative Way to Write It #

If you want to make it even clearer that you're handling all images as a set, you can do this instead (same end result):

images = [img1, img2]
# Use the first image as the base, append the rest
images[0].save(
    random_pdf_name,
    format="PDF",
    resolution=100.0,
    save_all=True,
    append_images=images[1:]
)

内容的提问来源于stack exchange，提问作者Arjay