BluePIL 0.1.1

Automatic memory management for Pillow - take the blue pill

BluePIL 💊

Take the blue pill. Your memory stays safe.

Stop fighting Pillow's memory leaks. BluePIL is a drop-in replacement that automatically handles cleanup so you don't have to.

The Problem

from PIL import Image

# Process 1000 images
for i in range(1000):
    img = Image.open(f'image_{i}.jpg')
    img = img.resize((800, 600))
    img.save(f'output_{i}.jpg')
    # img.close()  # Forgot this? RAM goes brrr 📈

Memory usage: 2GB+ and climbing 🔥

Here's the dirty secret: Pillow's Python objects get garbage collected just fine, but the underlying C image buffers don't get freed unless you explicitly call .close(). Python's GC has no idea those massive C allocations even exist.

The result? Your Python process looks lean to the GC while your actual RAM usage spirals out of control. You're forced to either:

• Manually call .close() everywhere like it's 1995
• Wrap everything in context managers
• Just accept the leak and provision 40GB of RAM (the HuggingFace strategy)

The Solution

from bluepil import Image

# Same code, zero leaks
for i in range(1000):
    img = Image.open(f'image_{i}.jpg')
    img = img.resize((800, 600))
    img.save(f'output_{i}.jpg')
    # Automatic cleanup ✨

Memory usage: Stable at 50MB ✅

Installation

pip install bluepil

Usage

Replace your Pillow import:

# Before
from PIL import Image

# After
from BluePIL import Image

That's it. Everything else works exactly the same.

How It Works

BluePIL wraps Pillow's Image class with automatic cleanup using weakref.finalize(). When an image goes out of scope, .close() is called automatically, releasing the C buffers immediately instead of leaking them forever.

Features

• ✅ Drop-in replacement for PIL.Image
• ✅ Zero API changes
• ✅ Automatic memory cleanup
• ✅ Context manager support
• ✅ Works with existing Pillow code

Why "BluePIL"?

"You take the blue pill, the story ends. You wake up in your bed and believe whatever you want to believe."

Take the blue pill. Stop worrying about memory leaks. Just process your images.

License

MIT

Contributing

Issues and PRs welcome at github.com/ewan-m/bluepil