Lumina — Automatically dims and brightens your…

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About this project

Lumina is a Rust-based Linux application that automatically manages screen brightness based on your location and the time of day. By creating a brightness curve that adapts from sunrise to sunset, Lumina simplifies the user experience, eliminating the need to manually adjust display settings throughout the day.

Key Features

Automatic Brightness Management: Lumina seamlessly adjusts display brightness throughout the day, ensuring optimal visibility without manual intervention
Location Detection: The application can automatically determine geographic coordinates using IP geolocation services, with a fallback for manual input if necessary
User-Friendly Interfaces: Choose between a lightweight command-line interface (CLI) or an intuitive graphical user interface (GTK4/libadwaita)
Smooth Brightness Transitions: Enjoy a gradual brightness change modeled on a sinusoidal brightness curve, avoiding abrupt changes
Configurable Brightness Limits: Users can set minimum and maximum brightness levels according to personal preferences
Multi-Display Support: Lumina supports multiple displays, tracking and adjusting brightness on each
Live Configuration Reload: Any changes made to the configuration are automatically detected while Lumina is running, eliminating the need for a restart

Technical Overview

Lumina operates based on the relationship between natural solar irradiance and screen brightness. By using location data to derive local sunrise and sunset times, Lumina ensures that the transition from sunrise to mid-day and then to sunset is mirrored effectively by managing the brightness of device displays.

In Practice

The flexible configuration allows users to dictate specific parameters, such as brightness minimum and maximum values, as well as custom scheduling of brightness adjustments.

Example Lumina Configuration

A typical configuration file may look like this:

# Lumina Configuration (TOML)

[location]
latitude = 47.9789803
longitude = -122.2020794

[brightness]
min = 20
max = 90

[schedule]
start_time = "07:00"
stop_time = "22:00"
interval_seconds = 60
respect_manual_changes = false

With Lumina, users in varying environmental conditions can minimize eye strain and maintain an optimal viewing experience. The application’s automation and customization ensure that each user can tailor display settings to fit their unique lifestyle and workstation conditions.

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