Show HN: Image-to-Dot-to-Dot Generator. Print Custom Puzzles

Hello HN, I’m launching ConnectTheDotsPrintable—a tool I built to solve a simple, yet surprisingly unmet need in the printable market.

The Problem Most existing dot-to-dot products are static, generic PDF files. If you want a dot-to-dot of your dog, your favorite landscape, or a child’s drawing, you're out of luck. The current options prioritize volume over personalization, missing the demand for custom digital goods seen on platforms like Etsy.

The Solution / How it Works I developed a backend image processing pipeline that uses edge detection and simplification algorithms to extract the core contours of any uploaded image. This process drastically reduces the number of points required while preserving the recognizable form.

The algorithm then intelligently places a sequence of numbered dots along the optimized contours. This isn't just a filter; it's a structural transformation to generate a genuine, solvable dot-to-dot puzzle.

Key Features / Tech Customization: Upload any JPG/PNG and get a personalized puzzle.

Vectorization: Outputs high-quality, print-ready PDF/Image files.

Performance: Image processing is handled server-side for rapid generation.

Tech Stack: Built with Python (for image processing algorithms) and React/Next.js for the frontend interface.

I'm keen to hear from the community: What other image processing features would make this a killer utility?