Redshift (software): Difference between revisions

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{{short description|Computer display color temperature auto-adjuster}}

{{for|the astronomy3D rendering software|Redshift (planetarium softwarerenderer)}}

{{Use dmy dates|date=January 20132023}}

{{Infobox software

| name = Redshift

| logo = Redshift-icon-256.png

| logo size = 64px

| screenshot = Redshift software on = Redshift-ubuntu-matePC.pngjpg

| screenshot size = 260px

| caption = Redshift 1.1112 activated on [[Ubuntu MATE]] 17[[Ubuntu 23.1004|23.04 AlphaLunar 2Lobster]]

| developer = [httpshttp://githubjonls.comdk/jonls Jon Lund Steffensen]

| released = {{Start date and age|df=yes|2009|11|04}}<ref>{{cite web|title=Redshift 0.1|website=[[GitHub]]|url=https://github.com/jonls/redshift/releases/tag/0.1|date=4 November 2009|accessdate=26 October 2013}}</ref>

| discontinued = yes

| latest release version = 1.12

| latest release date = {{release date and age|df=yes|2018|05|20}}<ref>{{cite web|title=Redshift releases|website=[[GitHub]]|url=https://github.com/jonls/redshift/releases/|date=2019-03-07}}</ref>

| programming language = [[C (programming language)|C]], [[Python (programming language)|Python]]

| operating system = [[BSD]], [[Linux]], [[Microsoft Windows|Windows]]

| replaced_by = gammastep

| language = English

| license = [[GNU General Public License|GPLv3]]

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

}}

'''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 numbercolor temperature in kelvins, 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 colourcolor temptemperature manually via a shortcut or panel launcher:

1# - createCreate 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

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>

2# - saveSave the file in your <code>/home/$user</code> directory.

3# - changeChange the properties of the file so it can be executed (can be done withusing <code>[[chmod]]</code> or context menu permissions).

4# - createCreate a new launcher ('"set temp'") referring to the file you have named above and select '"Open in Terminal'".

5# - createCreate a new launcher ('"exit redshift'") with the command '<code>redshift -x'</code> (no need to open this in terminal).

6# -Use usethe launcher to set temptemperature or exit redshiftRedshift.

== Forks ==

1 - create a new file and copy in the following:

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>

<p style="padding-left: 30px;"><em>#!/bin/bash</em><br /><em>shouldloop=true;</em><br /><em>while $shouldloop; do</em><br /><em>read -p "What temp would you like? 1000-25000K: " scale</em></p>

<p style="padding-left: 30px;"><em>if [[ "$scale" -ge 1000 &amp;&amp; "$scale" -le 25000 ]]</em><br /><em>then </em><br /><em>redshift -O $scale</em><br /><em>shouldloop=false;</em><br /><em>elif [[ $scale = "x" ]]</em><br /><em>then</em><br /><em> exit</em><br /><em>elif [[ $scale = "X" ]]</em><br /><em>then</em><br /><em> exit</em><br /><em>else</em><br /><em>echo "Invalid value or outside range. x to exit..."</em><br /><em>fi</em><br /><em>done</em></p>

2 - save the file in your /home/$user directory

3 - change the properties of the file so it can be executed (can be done with chmod or context menu permissions)

4 - create a new launcher ('set temp') referring to the file you have named above and select 'Open in Terminal'

5 - create a new launcher ('exit redshift') with the command 'redshift -x' (no need to open this in terminal)

6 - use launcher to set temp or exit redshift

== 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=https://lifehacker.com/redshift-makes-your-screen-easier-on-the-eyes-at-night-5567172|publisher=LifeHacker|accessdate=20 April 2020}}</ref><ref name=linuxmag>{{cite web|last1=Popov|first1=Dmitri|title=Improve Your Night Sleep with Redshift and F.lux|url=https://www.linux-magazine.com/Online/Blogs/Productivity-Sauce/Improve-Your-Night-Sleep-with-Redshift-and-F.lux|publisherwork=Linux Magazine|accessdate=20 April 2020}}</ref><ref name=makeuseof>{{cite web|last1=Pot|first1=Justin|title=Redshift Keeps Your Eyes Sharp & Helps You Sleep [Linux]|date=17 June 2010 |url=https://www.makeuseof.com/tag/redshift-eyes-sharp-helps-sleep-linux/|publisher=MakeUseOf|accessdate=20 April 2020}}</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" />

[[Ubuntu MATE]] plans to provideprovides Redshift as an application installed by default insince their upcoming release 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 ==

* [[F.lux]]

* [[Red Moon (software)]]

* [[Night Shift (software)]] -– a feature of macOS and iOS that provides a similar function

== References ==

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== 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-stub}}]]

[[Category:Software using the GNU General Public License]]