Apply stylized two-tone color grading using shadow and highlight luminance mapping.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Select your image file.
Select a preset (Cyberpunk, Spotify, Sunset) or pick custom shadow/highlight colors.
Fine-tune the duotone opacity.
Download your duotone graphic.
It maps dark pixels to shadow colors and light pixels to highlight colors.
Yes, all pixel computations execute in-browser with zero network calls.
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