A private photo and video editor that runs entirely in the browser.
Luminous designed and engineered an on-device creative tool for subject segmentation, text compositing, object removal, and high-resolution export—with no account, upload queue, or API key.
- Product
- Text Behind Subject
- Engagement
- Product development
- Industry
- Creator tools
- Focus
- Product strategy · Front-end · AI
The product problem
Putting text behind a subject normally means uploading media to a server or paying for a heavyweight editor. The product needed to segment images, composite type, process video, remove objects, and export high-resolution work entirely on the user's own machine.
What Luminous built
Built the effect as a three-layer composite: background, typography, then the alpha-cut subject.
Shipped multiple segmentation models and selected sensible defaults from the browser's actual WebGPU capabilities.
Added depth and paint-by-hand modes for scenes where one automatic model could not describe the intended subject.
Kept preview and export geometry resolution-independent so the same composition survives full-resolution output.
What the build delivers
Concrete product and engineering characteristics documented in the working build.
Product details reflect the reviewed build and its documented delivery state.