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How To Set a Fixed Temperature on Redshift

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Redshift is a popular application that adjusts the color temperature of your computer’s display according to the time of day. It’s especially useful for reducing eye strain during late-night computing sessions. In this article, we’ll guide you through the process of setting a fixed temperature on Redshift.

Quick Answer

To set a fixed temperature on Redshift, you can use either the command line or create a configuration file. Using the command line, you can enter a specific temperature value to set the color temperature instantly. Alternatively, creating a configuration file allows you to set a permanent temperature and customize other options.

What is Redshift?

Redshift is a program that adjusts the color temperature of your screen according to your surroundings. This may help your eyes hurt less if you are working in front of the screen at night. The color temperature transitions from daytime to nighttime to reduce strain on your eyes. However, there may be situations where you want to set a fixed color temperature. Let’s explore how to do that.

Setting a Fixed Temperature on Redshift

There are two main methods to set a fixed temperature on Redshift – using the command line and creating a configuration file.

Method 1: Command Line

The command line is a direct way to interact with your system. Here’s how to use it to set a fixed temperature on Redshift:

  1. Open the terminal on your system. This can usually be done by searching for ‘terminal’ in your system’s search bar.
  2. Enter the following command:
    redshift -O <temperature>
    Replace <temperature> with the desired color temperature value (measured in Kelvin). For example, to set the temperature to 3700K, the command would be:
    redshift -O 3700
    Press Enter to execute the command. The color temperature will be set to the specified value.

To reset the temperature to the default setting, use the following command:

redshift -x

This command resets the color temperature to the neutral setting, undoing any changes made with the -O option.

Method 2: Configuration File

The second method involves creating a configuration file for Redshift. This method is more permanent and doesn’t require you to input a command every time you want to change the temperature. Here’s how to do it:

  1. Open a text editor and create a file named redshift.conf in the ~/.config/ directory. If the directory doesn’t exist, create it.
  2. Copy and paste the following sample configuration into the file:
    ; Global settings for redshift
    [redshift]
    ; Set the day and night screen temperatures
    temp-day=5700
    temp-night=3500
    
    ; Enable/Disable a smooth transition between day and night
    ; 0 will cause a direct change from day to night screen temperature.
    ; 1 will gradually increase or decrease the screen temperature.
    transition=1
    
    ; Set the screen brightness. Default is 1.0.
    ;brightness=0.9
    ; It is also possible to use different settings for day and night
    ; since version 1.8.
    ;brightness-day=0.7
    ;brightness-night=0.4
    ; Set the screen gamma (for all colors, or each color channel
    ; individually)
    gamma=0.8
    ;gamma=0.8:0.7:0.8
    ; This can also be set individually for day and night since
    ; version 1.10.
    ;gamma-day=0.8:0.7:0.8
    ;gamma-night=0.6
    
    ; Set the location-provider: 'geoclue', 'geoclue2', 'manual'
    ; type 'redshift -l list' to see possible values.
    ; The location provider settings are in a different section.
    location-provider=manual
    
    ; Set the adjustment-method: 'randr', 'vidmode'
    ; type 'redshift -m list' to see all possible values.
    ; 'randr' is the preferred method, 'vidmode' is an older API.
    ; but works in some cases when 'randr' does not.
    ; The adjustment method settings are in a different section.
    adjustment-method=randr
    
    ; Configuration of the location-provider:
    ; type 'redshift -l PROVIDER:help' to see the settings.
    ; ex: 'redshift -l manual:help'
    ; Keep in mind that longitudes west of Greenwich (e.g. the Americas)
    ; are negative numbers.
    [manual]
    lat=48.1
    lon=11.6
    
    ; Configuration of the adjustment-method
    ; type 'redshift -m METHOD:help' to see the settings.
    ; ex: 'redshift -m randr:help'
    ; In this example, randr is configured to adjust screen 1.
    ; Note that the numbering starts from 0, so this is actually the
    ; second screen. If this option is not specified, Redshift will try
    ; to adjust _all_ screens.
    [randr]
    screen=1
  3. Modify the values in the configuration file according to your preferences. For instance, you can change the temp-day and temp-night values to set the desired color temperatures.
  4. Save the file and exit the text editor.
  5. Restart Redshift for the changes to take effect.

This configuration file is just an example. You can customize it further based on your requirements. Refer to the Redshift documentation (man redshift) for more information on available options.

Conclusion

Setting a fixed temperature on Redshift can be a great way to reduce eye strain and improve your computing experience. Whether you prefer using the command line for quick changes or setting up a configuration file for more permanent adjustments, Redshift offers a flexible solution for managing your screen’s color temperature.

Can I use Redshift on any operating system?

Yes, Redshift is available for various operating systems including Linux, Windows, and macOS.

How does Redshift adjust the color temperature?

Redshift adjusts the color temperature based on your location and the time of day. It uses your computer’s clock and geolocation data to determine the appropriate color temperature.

Can I customize the color temperature values in Redshift?

Yes, you can customize the color temperature values in Redshift by modifying the configuration file. The temp-day and temp-night values can be adjusted to your desired values.

Is it possible to set different color temperatures for day and night?

Yes, Redshift allows you to set different color temperatures for day and night. You can specify separate values for temp-day and temp-night in the configuration file.

How do I reset the color temperature to the default setting?

To reset the color temperature to the default setting, you can use the command redshift -x in the terminal. This command will undo any changes made with the -O option.

Can I adjust the screen brightness with Redshift?

Yes, Redshift allows you to adjust the screen brightness. You can modify the brightness value in the configuration file to set the desired brightness level.

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