GhostScale - The Offline Privacy Upscaler

A proof-of-concept offline image upscaler built with Flutter and Real-ESRGAN. Upscales images locally on your device without sending data to the cloud.

Features

• 🟢 100% Offline: No servers, no API keys. Everything runs on your device.
• 🔒 Privacy First: Your photos never leave your phone. No spying, no tracking.
• ⚡ Dual Modes:
  • Fast (Standard): Instant edge sharpening using a lightweight model.
  • Pro (Detail): Restores textures and details using the powerful Real-ESRGAN-x4plus model (downloaded on demand).
• 🚀 Resolution Control: Choose between 2K (Fast) for speed or 4K (Ultra) for maximum quality.

Technical Stack

• Framework: Flutter
• AI Inference: tflite_flutter with GpuDelegateV2 for hardware acceleration.
• Concurrency: Heavy processing runs in background Isolates using compute() to keep the UI silky smooth.
• State Management: flutter_riverpod.

Disclaimer

This project uses the Real-ESRGAN model architecture. The 'Pro' mode requires a capable device with a decent GPU for reasonable inference times. On older devices, processing may take significantly longer.

Getting Started

1. Clone the repository.
2. Run flutter pub get.
3. Connect an Android device.
4. Run flutter run.

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Built with ❤️ and privacy in mind.