GAMMA NODE

Brightness dimmer and blue light filter for Windows.

~5MB native binary · zero lag · GPU-native color control

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Features

• Brightness dimming — transparent overlay per-monitor, independent of Windows brightness
• Color temperature — real GPU gamma ramp shift via SetDeviceGammaRamp, works in fullscreen games
• System tray — close to tray, left-click toggle, right-click context menu
• Global hotkeys — toggle, brightness, and temperature control from any application
• Presets — Off, Read, Focus, Night, Dim
• Schedule — sunset/sunrise auto-transition using the NOAA solar algorithm

Keyboard Shortcuts

Shortcut	Action
Ctrl+Alt+B	Toggle filter on/off
Ctrl+Alt+Up / Ctrl+Alt+Down	Brightness ±5%
Ctrl+Alt+Left / Ctrl+Alt+Right	Temperature ±200K

Presets

Preset	Brightness	Temperature
Off	100%	6500K
Read	70%	4500K
Focus	90%	5500K
Night	30%	2700K
Dim	5%	500K

Tech Stack

• Backend: Rust (Tauri 2) + raw Win32 FFI for gamma ramp control
• Frontend: SvelteKit + Svelte 5 + TailwindCSS 4 + shadcn-svelte
• Typography: Geist + Geist Mono

Architecture

gamma-node (single Rust process)
├── Control Window    Svelte UI, tray-hidden on close
├── Overlay Windows   per-monitor, transparent, click-through
├── Gamma Ramp        Win32 GDI, real GPU output shift
├── System Tray       toggle, presets, quit
├── Global Hotkeys    brightness, temperature, toggle
└── Scheduler         tokio task, sunset/sunrise (NOAA)

Hybrid rendering model:

• Brightness → overlay opacity, works everywhere
• Color temperature → SetDeviceGammaRamp, real GPU shift that survives fullscreen exclusive

Development

cd gamma-node
npm install
npm run tauri dev

Build

npm run tauri build

Output:

src-tauri/target/release/bundle/nsis/gamma-node_*_x64-setup.exe

License

MIT © CodaCipher