How Face Blur Patches Stay Aligned During Export

Blurring a face is easy if you only care about a static demo. It gets more interesting when the user can redetect faces, expand padding, move patches, resize them, disable individual faces, change blur strength, and then export the final image without everything drifting out of alignment. The architecture that held up best for us was patch-based. The full companion guide is here: https://happyimg.com/guides/how-face-blur-patches-stay-aligned-during-export First build one blurred source image Ins