DSH Image Theme

A Warp-inspired image theme plugin for the DeepSeek Harness web client.

Upload or drag in a picture and the plugin will:

1. extract five dominant colors in CIE Lab space;
2. derive translucent light and dark glass surfaces from the darkest image color;
3. let you choose one extracted color as the DSH accent;
4. correct text and accent contrast before applying theme tokens;
5. use the original image as the full-window background.

Features

• Full-bleed background image with adjustable dark overlay, blur, saturation, and position.
• Deterministic five-color Lab k-means palette extraction in the browser.
• Live DSH token overrides through ctx.theme.overrideTokens()—no hard-coded edits to the host UI.
• A dedicated Settings → Image theme section with drag-and-drop upload and palette controls.
• Browser-local privacy: the image is stored as a Blob in IndexedDB and settings are stored in localStorage; nothing is uploaded.
• The plugin can be disabled without losing the selected image or settings.
• Responsive settings UI and reduced-motion support.

Install

The repository includes prebuilt lib/ artifacts, so a DSH profile can install it directly from GitHub:

dsh plugin --profile 
 add github:Carpon39038/dsh-image-theme

Use DSH 0.1.2-rc.1 with this plugin version. To upgrade the CLI:

npm install --global @deepseek-ai/dsh@0.1.2-rc.1
dsh --version

Restart or refresh the DSH web client, then open Settings → Image theme. Start the default Web profile with dsh web.

To install a local checkout while developing:

pnpm install
pnpm build
dsh plugin --profile 
 add link:$PWD

The included .npmrc disables automatic peer installation: DSH supplies Cordis, React, and the client UI services at runtime. Development dependencies pin the official DSH 0.1.2-rc.1 packages so TypeScript checks the actual published APIs.

How it works

Palette extraction

The browser downsamples the image to at most 96 × 96, samples at most 6,000 opaque pixels, converts RGB to CIE Lab, and runs deterministic k-means with farthest-point seeding. Five clusters are sorted by population.

This follows the same broad model as Warp's open-source theme creator, which uses Lab-space Hamerly k-means with k = 5. This implementation is written independently for the browser and uses deterministic seeding so the same pixels always produce the same palette.

Theme mapping

The plugin keeps the image, the dark surface color, the foreground, and the accent as separate roles:

image → five-color palette → darkest color → light/dark glass surfaces
                           ↘ selected color → contrast-safe accent

It overrides DSH's public alias tokens, including:

• --dsw-alias-bg-base
• --dsw-alias-bg-layer-1
• --dsw-alias-bg-layer-2
• --dsw-alias-bg-overlay
• --dsw-alias-border-l1 / --dsw-alias-border-l2
• --dsw-alias-brand-primary
• --dsw-alias-label-primary / --dsw-alias-label-secondary
• --dsw-specific-sidebar-fill

Every override contains separate light and dark values, as required by the DSH theme runtime. Light mode uses a pale surface and dark text; dark mode uses a dark surface and light text. System mode follows the active host palette.

Background rendering

A plugin-owned fixed backdrop sits behind the DSH root. The application tokens stay translucent, allowing the image to show through while the overlay and surface opacity protect readability. Unloading or disabling the plugin disposes the token layer and removes the backdrop cleanly.

Development

Requirements: Node.js 22+ and pnpm 10+.

pnpm install
pnpm typecheck
pnpm test

pnpm test rebuilds the distributable first, then runs palette tests and integration checks against the published DSH ThemeRuntime, LocaleRuntime, and SlotRegistry. The integration checks load the actual lib/client.js wrapper in a simulated DOM, restore an existing saved wallpaper, mount the settings component, and exercise locale changes, theme updates, disabling/re-enabling, settings-slot remounts, and plugin disposal. These checks do not start a Web server or replace a visual browser review.

The interactive design preview is in playground/:

cd playground
npm install
npm run dev

The preview imports the same palette and role-mapping modules used by the real plugin. Its generated concert background is a clean demonstration asset, not a copy of Warp UI.

Project layout

src/client/palette.ts          Lab conversion and deterministic k-means
src/client/theme.ts            DSH token and contrast mapping
src/client/controller.ts       lifecycle, persistence, backdrop, token disposal
src/client/storage.ts          IndexedDB image + localStorage settings
src/client/ImageThemeSection.tsx
                               DSH settings page
playground/                    runnable interactive visual preview

Compatibility

Plugin 0.1.1 targets DeepSeek Harness 0.1.2-rc.1 and Cordis 4.0.2. Client contexts now come from @deepseek-ai/cordis, and the slots service comes from @deepseek-ai/dsh-client-ui-renderer; the removed dsh-client-runtime package is no longer requested. Only packages with a browser plugin entry appear in dsh.client.inject. DSH is still moving quickly; verify the published client APIs before upgrading further.

Existing version-1 image settings and IndexedDB images are retained. The earlier light-mode contrast fix is included.

The plugin is web-only. Images and preferences are local to each browser profile and are not synchronized between devices.

Credits

• DeepSeek Harness for the plugin, settings-slot, and theme-token APIs.
• Warp for the open-source theme-creator reference and the separation of image, background, foreground, accent, and opacity roles.

License

MIT