如何基于PIL实现文件夹内所有图片的批量尺寸调整？技术求助

No problem! Let's take your single-image resize code and expand it to handle every image in a folder in one go. Here's a straightforward solution with explanations:

First, Quick Setup Check #

You already have Pillow and resizeimage installed, so we just need Python's built-in os module (no extra installs required) to scan and manage files in your folder.

The Batch Resize Script #

This code will process every image in your target folder, resize them using the same resize_cover method you're already using, and save resized versions without overwriting your original files:

from PIL import Image
from resizeimage import resizeimage
import os

# Configure these values to match your needs
TARGET_FOLDER = "./your-image-folder"  # Replace with your actual folder path
RESIZE_DIMENSIONS = [200, 100]  # Keep your desired width/height here
IMAGE_EXTENSIONS = ('.jpeg', '.jpg', '.png', '.gif')  # Add more formats if needed

# Loop through every file in the target folder
for filename in os.listdir(TARGET_FOLDER):
    # Skip any non-image files
    if not filename.lower().endswith(IMAGE_EXTENSIONS):
        continue
    
    # Build full paths for input and output files
    input_file_path = os.path.join(TARGET_FOLDER, filename)
    # Create a unique output filename (adds "-resized" to avoid overwrites)
    file_name, file_ext = os.path.splitext(filename)
    output_filename = f"{file_name}-resized{file_ext}"
    output_file_path = os.path.join(TARGET_FOLDER, output_filename)
    
    # Process the image (mirrors your single-image workflow)
    try:
        with open(input_file_path, 'r+b') as f:
            with Image.open(f) as image:
                resized_image = resizeimage.resize_cover(image, RESIZE_DIMENSIONS)
                resized_image.save(output_file_path, image.format)
        print(f"✅ Resized successfully: {filename}")
    except Exception as e:
        print(f"❌ Failed to resize {filename}: {str(e)}")

Key Details to Note #

• Folder Traversal: os.listdir(TARGET_FOLDER) grabs every file in your specified folder—we filter out non-images with the endswith check to avoid errors.
• Safe File Saving: We add a -resized suffix to each output file so your original images stay untouched.
• Error Handling: The try/except block catches issues like corrupted images or unsupported formats, so the script keeps running instead of crashing mid-batch.

How to Use This #

1. Replace ./your-image-folder with the actual path to your image folder (e.g., ./vacation-photos or C:\\Users\\YourName\\Pictures on Windows).
2. Adjust RESIZE_DIMENSIONS if you need different width/height values.
3. Add more extensions to IMAGE_EXTENSIONS (like .webp) if you work with other image formats.
4. Run the script—all resized images will appear in the same folder with the -resized tag.

Bonus: Save to a Separate Folder #

If you don't want resized images cluttering your original folder, create a new folder (e.g., ./resized-images) and update the output_file_path line to:

output_file_path = os.path.join(TARGET_FOLDER, "resized-images", output_filename)

Just make sure the resized-images folder exists before running the script!

内容的提问来源于stack exchange，提问作者xxxx