Observed arrival · 2026-09-08
Duotone.dev, where luminance gets remapped
A browser-based image tool that maps photograph luminance between two colours and exports the result as SVG, Canvas, CSS, or hex stops.
Field notes
The tool maps each image pixel through a 256-stop colour ramp, with midpoint and contrast controls determining how source tones are placed. Its stated luminance method is the WCAG relative-luminance formula in linear light, avoiding the channel-averaging shortcut the guide says can distort greens and blues. Outputs include an SVG filter, Canvas code, and plain hex stops, while six named presets provide starting configurations for subjects such as cyanotype, newsprint, and fuchsia.
Observed signals
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Editorial observations of this landing page, not a rating.
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