Duotone Image Effect
Map photos to two brand colors for striking graphics. Pick shadow and highlight tones — instant gradient-map look.
About the Duotone Effect
Duotone remaps luminance onto a two-color gradient — dark areas take your shadow color, bright areas your highlight color. It's the signature look of Spotify branding and modern web heroes: instantly graphic and perfectly on-brand.
How it works
The tool converts your image to luminance, then maps that brightness ramp between two colors you choose: dark tones take the shadow color, bright tones take the highlight color, and midtones blend along the way. It's the gradient-map technique behind modern brand graphics and Spotify-style covers.
How to use it
Drop up to 10 images, pick a shadow color and a highlight color (default dark navy and white work with everything), and process. Preview the mapping, tweak colors, and download.
Supported formats & limitations
Accepts .jpg, .png and .webp up to 30MB each, 10 per batch. Output is a full-color image even though it contains two hues; for strict two-color printing workflows, posterize afterward to reduce the midtone ramp.
Common use cases
Branded social posts and event graphics where photos must match corporate colors, album and podcast cover art, hero images that sit behind colored overlays, and cohesive team or campaign imagery from mixed source photos.
Frequently asked questions
Is my image uploaded to a server when I use Duotone Effect?
Everything runs locally in your browser via the Canvas API. Your picture never leaves your machine — there is no upload step at all, so processing is as private as working in an offline editor.
Which input formats does Duotone Effect accept?
Common formats are covered: JPG, PNG or WEBP, each up to 30 MB. Paste from the clipboard, drag and drop, or use the select button.
What are the size and batch limits?
Up to 10 images per batch, 30 MB per file, and unlimited runs — no signup, no counters, and no watermark stamped on results.
Can I fine-tune the result before downloading?
The controls cover Shadow color, Highlight color. Nothing is baked in until you press the action button, and every run gives you a fresh preview to check.
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