Spotify-Style Duotone & Gradient Map Photo Studio
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. No data is ever transmitted across the network.
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.
How to Use Spotify-Style Duotone & Gradient Map Photo Studio
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.
Frequently Asked Questions
How does duotone mapping work?
It maps dark pixels to shadow colors and light pixels to highlight colors.
Are my photos private?
Yes, all pixel computations execute in-browser with zero network calls.
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