98 lines
3.6 KiB
Markdown
98 lines
3.6 KiB
Markdown
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Redshift
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========
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Redshift adjusts the color temperature of your screen according to
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your surroundings. This may help your eyes hurt less if you are
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working in front of the screen at night.
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Run `redshift -h` for help on command line options. You can run the program
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as `redshift-gtk` instead of `redshift` for a graphical status icon.
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* Website: http://jonls.dk/redshift/
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* Project page: https://github.com/jonls/redshift
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Build status
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------------
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[](https://travis-ci.org/jonls/redshift)
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Building from source
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--------------------
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See the file [HACKING](HACKING.md) for more details on building from source.
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FAQ
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---
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**Where can I find my coordinates to put in the configuration file?**
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There are multiple web sites that provide coordinates for map locations, for
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example clicking anywhere on Google Maps will bring up a box with the
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coordinates. Remember that longitudes in the western hemisphere (e.g. the
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Americas) must be provided to Redshift as negative numbers.
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**Why doesn't Redshift work on my Chromebook/Raspberry Pi?**
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Certain video drivers do not support adjustable gamma ramps. In some cases
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Redshift will fail with an error message, but other drivers silently ignore
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adjustments to the gamma ramp.
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**Why doesn't Redshift change the backlight when I use the brightness option?**
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Redshift has a brightness adjustment setting but it does not work the way most
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people might expect. In fact it is a fake brightness adjustment obtained by
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manipulating the gamma ramps which means that it does not reduce the backlight
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of the screen. Preferable only use it if your normal backlight adjustment is
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too coarse-grained.
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**Why doesn't Redshift work on Wayland (e.g. Fedora 25)?**
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The Wayland protocol does not support Redshift. There is currently no way for
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Redshift adjust the color temperature in Wayland.
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**Why doesn't Redshift work on Ubuntu with Mir enabled?**
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Mir does not support Redshift.
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**The redness effect is applied during the day instead of at night. Why?**
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This usually happens to users in America when the longitude has been set in the
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configuration file to a positive number. Longitudes in the western hemisphere
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should be provided as negative numbers (e.g. New York City is at approximately
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latitude/longitude 41, -74).
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**Why does the redness effect occasionally switch off for a few seconds?**
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Redshift uses the gamma ramps of the graphics driver to apply the redness
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effect but Redshift cannot block other applications from also changing the
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gamma ramps. Some applications (particularly games and video players) will
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reset the gamma ramps. After a few seconds Redshift will kick in again. There
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is no way for Redshift to prevent this from happening.
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**Why does the redness effect continuously flicker?**
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You may have multiple instances of Redshift running simultaneously. Make sure
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that only one instance is running for the display where you are seeing the
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flicker.
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**Why doesn't Redshift change the color of the mouse cursor?**
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Mouse cursors are usually handled separately by the graphics hardware and is
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not affected by gamma ramps. Some graphics drivers can be configured to use
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software cursors instead.
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**I have an issue with Redshift but it was not mentioned in this FAQ. What
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do I do?**
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Please go to [the issue tracker](https://github.com/jonls/redshift/issues) and
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check if your issue has already been reported. If not, please open a new issue
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describing you problem.
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Donations
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---------
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[](https://flattr.com/thing/57936/Redshift)
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