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{{short description|Computer display color temperature auto-adjuster}}
{{for|the
{{Use dmy dates|date=January
{{Infobox software
| name
| logo
| logo size = 64px
|
| screenshot size = 260px
| developer = [https://github.com/jonls Jon Lund Steffensen]▼
| caption = Redshift 1.12 activated on [[Ubuntu]] [[Ubuntu 23.04|23.04 Lunar Lobster]]
| released = {{Start date and age|df=yes|2009|11|04}}<ref>{{cite web|title=Redshift 0.1|url=https://github.com/jonls/redshift/releases/tag/0.1|date=4 November 2009|accessdate=26 October 2013}}</ref>▼
| latest release version = 1.11▼
|
| discontinued = yes
| operating system = [[BSD]], [[Linux]], [[Microsoft Windows|Windows]]▼
▲|
| language = English▼
| programming language = [[C (programming language)|C]], [[Python (programming language)|Python]]
| license = [[GNU General Public License|GPLv3]]▼
| website = http://jonls.dk/redshift/▼
| replaced_by = gammastep
}}
'''Redshift''' is an application that adjusts the [[computer display]]'s [[color temperature]] based upon the time of day.
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
▲'''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>
== Features ==▼
▲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 K, preferably matching the room's [[lighting]] temperature. Typical color temperature during the daytime is 5500–6500 K.
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
▲==Features==
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.▼
▲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|sun'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.
=== Interfaces ===
▲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" />
Redshift originally had only a [[command-line interface]], but now has [[graphical user interface]]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.
▲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.
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 the color temperature in kelvins, from 1000 to 25000) will set the temperature, and the command <code>redshift -x</code> to exit Redshift.
==Reviews==▼
A simple script can be made and called upon to set the color temperature manually via a shortcut or panel launcher:
Redshift has been positively reviewed by Linux users,<ref name=lifehacker>{{cite web|last1=Gordon|first1=Whitson|title=RedShift Makes Your Screen Easier on the Eyes at Night|url=http://lifehacker.com/5567172/redshift-makes-your-screen-easier-on-the-eyes-at-night|publisher=LifeHacker|accessdate=3 March 2015}}</ref><ref name=linuxmag>{{cite web|last1=Popov|first1=Dmitri|title=Improve Your Night Sleep with Redshift and F.lux|url=http://www.linux-magazine.com/Online/Blogs/Productivity-Sauce/Improve-Your-Night-Sleep-with-Redshift-and-F.lux|publisher=Linux Magazine|accessdate=3 March 2015}}</ref><ref name=makeuseof>{{cite web|last1=Pot|first1=Justin|title=Redshift Keeps Your Eyes Sharp & Helps You Sleep [Linux]|url=http://www.makeuseof.com/tag/redshift-eyes-sharp-helps-sleep-linux/|publisher=MakeUseOf|accessdate=3 March 2015}}</ref> who note that Redshift has some installation and user interface advantages compared to the [[f.lux]] Linux port [[XFlux|xflux]]. However, f.lux's systems have since been updated to enhance its dimmed display.<ref name="lifehacker" /> ▼
# Create a new file and copy in the following:<syntaxhighlight lang="bash>
#!/bin/bash
shouldloop=true;
while $shouldloop; do
read -p "What temp would you like? 1000-25000K: " scale
if "$scale" -ge 1000 && "$scale" -le 25000; then
[[Ubuntu MATE]] plans to provide Redshift as an application installed by default in their upcoming release 17.10.<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>▼
redshift -O $scale
shouldloop=false;
elif $scale = "x"; then
exit
elif $scale = "X"; then
exit
else
echo "Invalid value or outside range. x to exit..."
fi
done
</syntaxhighlight>
# Save the file in your <code>/home/$user</code> directory.
# Change the properties of the file so it can be executed (using <code>[[chmod]]</code> or context menu permissions).
# Create a new launcher ("set temp") referring to the file you have named above and select "Open in Terminal".
# Create a new launcher ("exit redshift") with the command <code>redshift -x</code> (no need to open this in terminal).
# Use the launcher to set temperature or exit Redshift.
==
Since 14 Jun 2020, Redshift development has been 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>
▲== Reviews ==
▲Redshift has been positively reviewed by Linux users,<ref name=lifehacker>{{cite web|last1=Gordon|first1=Whitson|title=RedShift Makes Your Screen Easier on the Eyes at Night|date=18 June 2010 |url=
▲[[Ubuntu MATE]]
[[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 ==
* [[F.lux]]
* [[Night Shift (software)]] – a feature of macOS and iOS that provides a similar function
== References ==
{{Reflist}}
== External links ==
* [https://github.com/jonls/redshift Project website] on [[GitHub
* [https://gitlab.com/chinstrap/gammastep gammastep] on [[GitLab]] (Redshift fork)
* [https://github.com/faf0/sct Xsct] on [[GitHub]] (a minimalistic Redshift and f.lux implementation for [[X11]])
[[Category:2011 software]]
▲[[Category:Free software]]
[[Category:Ergonomics]]
[[Category:Sleep]]
[[Category:Free software programmed in C]]
[[Category:Free software programmed in Python]]
[[Category:Cross-platform free software]]
[[Category:Software using the GNU General Public License]]
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