Redshift (software): Difference between revisions

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| website = http://jonls.dk/redshift/

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'''Redshift''' is an application that adjusts the [[computer display]]'s [[color temperature]] based upon the time of day. The program is [[free software]], and is intended to reduce eye strain, as well as [[insomnia]]<ref name="github">[https://github.com/jonls/redshift/releases/tag/v1.9 Github release 1.9].</ref> (see [[{{slink|Sleep#Circadian clock]]}} and [[{{slink|Phase response curve#Light]]}}).

Redshift transitions the computer display's color temperature evenly between [[daylight|daytime]] and [[night]] temperatures to allow the user's eyes to slowly adapt. At night, the color temperature is low and is, typically 3000–4000 &nbsp;K, and preferably matching the room's [[lighting]] temperature. Typical color temperature during the daytime is 5500–6500 &nbsp;K.

== Features ==

Redshift is primarily distributed for and used on the [[Linux]] [[operating system]].

Redshift can be used to set a single color temperature and brightness ("one -shot mode") or can adjust the temperature and brightness continuously to follow the [[Solar elevation|sunSun's elevation]], in which case it will transition to the night color temperature settings near [[twilight]]. The temperature and brightness settings for daytime and night can be user-configured.

To determine the [[Solar elevation|Sun's elevation]], the software requires the user's ___location in form of [[Geographic coordinate#Geographic latitude and longitude|latitude and longitude]].<ref name="github" />

On Linux and [[BSD]] operating systems, Redshift supports multiple monitors through the [[X Window System|X]] extensions [[RandR]] (preferred) or [[VidMode]], or through the [[Direct Rendering Manager]]. Because Redshift can only be configured to use the same [[gamma correction]] on all monitors it controls, it is usually desirable to run one instance of the program per monitor.

=== Interfaces ===

Redshift originally possessedhad only a [[command-line interface]], but now has [[GUI|graphical user interfacesinterface]]s (GUIs) that support most Linux desktop environments. Those GUIs include redshift-gtk, redshift-plasmoid, and nightshift.

redshift-gtk is included in Redshift's source tree. In addition to a windowed interface, it provides a tray status icon that can enable or disable Redshift or adjust the screen's color temperature automatically.

Redshift can be opened with the use of terminal, panel launchers or startup commands: the command '<code>redshift -O #TEMP'</code> (<code>#TEMP</code> being athe color temperature in numberkelvins, from 1000 to 25000) will set the temperature, and the command '<code>redshift -x'</code> to exit Redshift.

A simple script can be made and called upon to set the colour temp manually via a shortcut or panel launcher:

A simple script can be made and called upon to set the colourcolor temptemperature manually via a shortcut or panel launcher:

# Create a new file and copy in the following:<syntaxhighlight lang="bash>

#!/bin/bash

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== Forks ==

Since 14 Jun 2020, Redshift development has been unnoticibly abandoned.

Since 27 August 2023, [[Debian]] users are recommended to use <code>gammastep</code>, a Redshift fork, instead.<ref>{{Cite web |title=Chinstrap / gammastep · GitLab |url=https://gitlab.com/chinstrap/gammastep |access-date=2024-09-09 |website=GitLab |language=en}}</ref><ref>{{Cite web |title=Redshift - Debian Wiki |url=https://wiki.debian.org/Redshift |access-date=2024-09-09 |website=wiki.debian.org}}</ref><ref name=":0">{{Cite web |title=Redshift is Deprecated and no longer maintained anymore. Use gammastep As Replacement In Future Releases · linuxmint · Discussion #174 |url=https://github.com/orgs/linuxmint/discussions/174 |access-date=2024-09-09 |website=GitHub |language=en}}</ref>

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[[Ubuntu MATE]] provides Redshift installed by default since their 17.10 release.<ref>{{Cite news|url=https://ubuntu-mate.org/blog/ubuntu-mate-artful-alpha2/|title=Ubuntu MATE 17.10 Alpha 2|last=Wimpress|first=Martin|date=2017-07-28|work=Ubuntu MATE|access-date=2017-08-08|language=en}}</ref>

[[Linux Mint]] Cinnamon provides Redshift installed by default since their 18.3 release.<ref>{{Cite news|url=https://www.linuxmint.com/rel_sylvia_cinnamon_whatsnew.php|title=New features in Linux Mint 18.3 Cinnamon|work=Linux Mint|access-date=2017-12-01|language=en}}</ref> Since development of Redshift has been abandoned, Linux Mint is looking for a replacement.<ref name=":0" />

== See also ==

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[[Category:Free software programmed in Python]]

[[Category:Cross-platform free software]]

[[Category:Software using the GPLGNU licenseGeneral Public License]]