Compresseur d'image

# Compress images with Pillow
# pip install Pillow

from PIL import Image
import os

def compress_image(input_path: str, output_path: str, quality: int = 80,
                   max_width: int = None, format: str = None) -> dict:
    """
    Compress an image file.
    quality: 1-95 for JPEG/WebP (80-85 is a good balance)
    max_width: resize to this width while maintaining aspect ratio (optional)
    format: "JPEG", "WEBP", "PNG" — defaults to same as input
    """
    img = Image.open(input_path)
    original_size = os.path.getsize(input_path)

    # Convert RGBA to RGB for JPEG output
    output_format = format or img.format or "JPEG"
    if output_format.upper() in ("JPEG", "JPG") and img.mode in ("RGBA", "P"):
        img = img.convert("RGB")

    # Optional resize
    if max_width and img.width > max_width:
        ratio = max_width / img.width
        new_size = (max_width, int(img.height * ratio))
        img = img.resize(new_size, Image.LANCZOS)

    save_kwargs = {}
    if output_format.upper() in ("JPEG", "JPG"):
        save_kwargs = {"quality": quality, "optimize": True, "progressive": True}
    elif output_format.upper() == "WEBP":
        save_kwargs = {"quality": quality, "method": 6}
    elif output_format.upper() == "PNG":
        save_kwargs = {"optimize": True, "compress_level": 9}

    img.save(output_path, format=output_format.upper(), **save_kwargs)

    new_size = os.path.getsize(output_path)
    reduction = (1 - new_size / original_size) * 100
    print(f"Original: {original_size/1024:.1f} KB")
    print(f"Compressed: {new_size/1024:.1f} KB")
    print(f"Reduction: {reduction:.1f}%")
    return {"original_kb": original_size/1024, "compressed_kb": new_size/1024, "reduction_pct": reduction}

# Batch compress all images in a folder
import glob

def batch_compress(folder: str, quality: int = 80):
    for path in glob.glob(f"{folder}/*.jpg") + glob.glob(f"{folder}/*.jpeg"):
        name = os.path.splitext(path)[0]
        out = f"{name}_compressed.jpg"
        compress_image(path, out, quality=quality)
        print(f"Processed: {os.path.basename(path)}")

# Usage
compress_image("photo.jpg", "photo_compressed.jpg", quality=80)
compress_image("image.png", "image.webp", format="WEBP", quality=80)
batch_compress("./images", quality=75)