Duotone Image

Map luminance between two selected colours.

Open this tool

Two chosen colours can represent the picture's darker and lighter tones.

Select both endpoints and inspect the subject's tonal separation.

Inputs and controls

One image or a batch

Source images

JPEG, PNG, WebP

Static images. Up to 4 MiB per file, 12 MiB total and 4 million pixels per image. At most six source images.

Shadow colour

Tool inputs

Highlight colour

Tool inputs

Download format

Tool inputs

PNG, preserves alpha, JPEG, flattens alpha, WebP, server support needed

Quality

Tool inputs

Allowed range: 1 to 100

How to use

Choose a static JPEG, PNG or WebP source. Check the displayed upload limits before processing.
Set Shadow colour, Highlight colour, Download format and Quality. Review the selected units and options before preparing the output.
Select Prepare image. Inspect the resulting preview, dimensions and file size, then download the output you need.

Why use this tool

The mapping gives a consistent two colour style while keeping the luminance relationship visible.

Before relying on the result

Compare the finished picture with its source. They can be, but weak separation may hide detail. Choose endpoints that suit the intended appearance.

Questions

Should the two colours be nearly identical?

They can be, but weak separation may hide detail. Choose endpoints that suit the intended appearance.

What should I check before using Duotone Image?

Prepare a supported source image and check Shadow colour, Highlight colour, Download format and Quality. Use the exact units shown beside the controls and replace any example values with your own inputs.

Source page last modified: 2026-10-04T18:22:34+00:00. This profile describes the tool; use its page to run it.

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