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| license = [[GNU General Public License|GPLv3]]
| 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>
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.
== Features ==
Redshift is primarily distributed for and used on the [[Linux]] [[operating system]]. Initially it had been designed to be controlled from the [[command line]], but meanwhile has added [[Graphical user interface|GUI]] interfaces to support most Linux desktop environments. Those frontends include redshift-gtk, redshift-plasmoid, and nightshift. redshift-gtk is included in Redshift's source tree. In addition it provides a tray status icon that can enable or disable Redshift, or adjust the color temperature automatically.
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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.
== 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|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" />
[[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>
== See also ==
* [[Red
== References ==
{{Reflist}}
== External links ==
* [https://github.com/jonls/redshift Project website] on [[GitHub]]
{{Software-stub}}
[[Category:2011 software]]
[[Category:Free software]]
[[Category:Ergonomics]]
[[Category:Sleep]]
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