RedLight

RedLight is a lightweight Windows utility that applies a customizable full-screen color filter. It is designed to help reduce eye strain (via a red filter for night use) or assist with accessibility by providing various color simulations.

📥 Download

You can download the latest (RedLightForWindows.zip) from the Releases page.

Features

• Full-Screen Filters: Apply various color matrices to the entire screen using the Windows Magnification API.
• Filter Modes:
  • Red: Reduces blue light, ideal for night usage.
  • Grayscale: Converts the screen to black and white.
  • Color Blindness Simulations: Protanopia (Red/Green), Deuteranopia (Green/Red), and Tritanopia (Blue/Yellow).
  • Color Tint: Choose any custom color to tint the screen.
• Adjustable Intensity: Fine-tune the strength of the filter using a slider.
• System Tray Integration: Runs quietly in the background; double-click the tray icon to open settings.

Requirements

• Windows 10 or Windows 11
• .NET 10.0 Runtime

Development

Building from Source

1. Clone the repository.
2. Ensure you have the .NET 10.0 SDK installed.
3. Open the solution RedLightForWindows.slnx in Visual Studio or VS Code.
4. Build the project:

   dotnet build

Usage

1. Run the application (dotnet run or via the executable).
2. Check Enable Filter to start.
3. Select a Filter Type from the dropdown.
4. Adjust the Intensity slider to control the effect strength.
5. If using "Color Tint", click the color box to choose a custom color.
6. Closing the window minimizes the application to the system tray. Right-click the tray icon to Exit completely.

Technology Stack

• Framework: .NET 10 (WPF & Windows Forms components)
• API: Windows Magnification API (MagSetFullscreenColorEffect)