1. Introduction
6 minStep 1 of 19
Build a Flask app that watermarks uploads — logo overlay or text, with OpenCV
What you'll need
- •Python 3.8–3.10 recommended. You need a terminal, a code editor, and pip. Tesseract not required for this project.
Why this matters
Watermarking is a real deployable skill: protect stock photos, brand social images, or preview paid assets. You practice the same loop as production ML apps — upload → process with OpenCV → return a file — without needing a GPU.
What you'll have at the end
A local Flask site at http://127.0.0.1:5000 where you upload a photo, pick logo or text mode, and see the watermarked result in the browser. That is portfolio-ready full-stack Python work.
FlaskOpenCVPILfile uploadnumpy ROI
