What this tool does
Duotone Image Generator maps image brightness into a shadow color and highlight color to create two-color artwork.
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🌗 Duotone Image Generator
Turn photos into local two-color duotone artwork with palette presets, custom colors, before/after preview, and download. Free and browser-local.
Choose a photo to start. Duotone mapping runs locally in this browser.
Why it is useful
It helps make fast poster graphics, social thumbnails, presentation visuals, and brand-tinted assets without uploading the source image.
How it works
The selected image is decoded locally, drawn to a canvas, converted to grayscale luminance, then remapped between the chosen shadow and highlight colors pixel-by-pixel.
Best input
Use photos, screenshots, or illustrations with clear contrast. Flat or very dark images may need a contrast adjustment before the duotone reads well.
Style controls
Start from a palette preset, customize both colors, tune intensity and contrast, then export PNG, JPG, or WebP.
Privacy note
Image processing is browser-local. The page does not intentionally upload selected images or save them to a server.
Important limitation
Duotone output is a creative approximation, not calibrated print prepress. Canvas exports can remove metadata, flatten animated images, and shift color profiles.
Quick answers
Does this upload my image?
No. The duotone effect uses local browser APIs and Canvas processing.
Can I use custom brand colors?
Yes. Pick any shadow and highlight color with the color controls after choosing a preset.
Common Use Cases
Create a two-color social graphic
Turn a product, profile, or event photo into a bold duotone thumbnail.
Match an image to brand colors
Use custom shadow and highlight colors to create quick campaign art.
Prepare presentation artwork
Make high-contrast, consistent visuals while keeping the untouched original file.
Photo Effects Studio workflow
Move between vintage, duotone, noir, vignette, grain, cinematic color grade, and background blur effects while keeping selected image pixels local to the browser.