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-NAME
- radharc - Reduce eye strain and improve sleep.
-
-PRONUNCIATION
- ɹˈaɪɐrk (depending on dialect)
-
-SYNOPSIS
- radharc [OPTIONS]...
-
- The -l option is mandatory, unless single value -t is used.
-
-OPTIONS
- -l LATITUDE:LONGITUDE
- Tell radharc where you are. This is mandatory.
- The values are measured in degrees and in the
- GPS (you probably do not have too care about that,
- the differences between the systems should not
- be significant another), and must be in decimal.
-
- Reminder for Americans (particularly US Americans),
- you are an the western hemisphere, not the eastern,
- thus your longtiude is negative. If you experience
- weird colour temperatures, 100 % of the times it is
- because you forgot the minus sign. But no need to
- feel stupid, it is a really common mistake.
-
- No complicated stuff please, only latitudes within
- ±90° and longitudes within ±180°. No unit thought.
-
- -t DAY:NIGHT
- Select colour temperature to use during full daytime
- and full night. This should be a integer. Do not
- include the unit (the 'K'). The temperatures must
- be at least 1000 K.
-
- -t TEMPERATURE
- Select temperature to use. The program will exit
- when it is done setting the temperature. The
- natural colour temperature is 6500 K ('-t 6500').
- The temperature must be at least 1000 K.
-
- -t +DELTA
- Increase the colour temperature by DELTA kelvin.
-
- -t -DELTA
- Decrease the colour temperature by DELTA kelvin.
-
- -T TEMPERATURE
- Temperature that shall be used when the program
- is disabled (via SIGUSR1).
-
- -p Print the current status.
-
- -n Set the temperature immediately, do not transition.
-
- -N Do not transition when exiting, disabling, or
- reenabling.
-
- -o Set the colour, and exit.
-
- -x Ignore the current calibrations on the monitors.
-
- -s SECONDS
- The start and exit transitions shall take SECONDS
- seconds. This may be a floating point number, with
- an explicit unit.
-
- -S KELVINS
- The transitions speed, in kelvin per second.
- This most be a positive integer.
-
- -i
- Apply negative image filter. Radharc will detect
- which monitors have this one when it starts.
-
- -h PATHNAME
- Use a hook script for events.
-
- -b
- Broadcast events with bus.
-
- -d SERVER=DISPLAY
- Use the display server whose identifier is
- DISPLAY and whose identifier is stored in the
- environment variable SERVER, for example
- -d DISPLAY=:0 for the X display :0.
-
- -d SYSTEM
- Use a subsystem which does not have identifiers.
- For example 'drm' for the Direct Rendering Manager.
- You can also select 'none', this is useful if you
- don't want any adjustments, but want events to be
- broadcasted.
-
- -e EDID
- Select monitor to use by its EDID.
-
- -m NUM
- Select monitor to use by its global index.
-
- -m SCREEN:NUM
- Select monitor to use by its index without
- a screen or graphic card. The later is for when
- not inside a graphics environment.
-
- All options also have a '+' variant, for example '+n'.
- These undo the affect of previous '-' variant.
- '+d', '+e', and '+m' all undo the affect of all previous
- '-d', '-e', and '-m' options (not respectively).
- Additionally, with the exception of '-d', '-e', '-m',
- subsequent options override the previous of the the option.
-
-SIGNALS
- SIGHUP
- Perform an online update to a newer version.
-
- SIGUSR1
- Enable or disable radharc.
-
- SIGUSR2
- Toggle negative image filter. Enable on all
- monitors if it is enable on some but not all.
-
- SIGRTMIN+N
- Toggle negative image on monitor N, if monitors
- have been selected manually, it will be in the
- order they where selected.
-
-ENVIRONMENT
- XDG_RUNTIME_DIR
- This environment variable names the directory in which
- the state file is stored. If unset or empty, /run is
- used.
-
- RADHARC_STATE
- The pathname to the state file, will be determined
- automatically if not set. If not set, you may only
- have one instance running per display server instance.
-
-RATIONALE
- Your location is determined use GeoClue because it clunky,
- unreliable, inaccurate and requires an Internet connection
- or GPS device, it is way to common that neither is available.
- And I do not want to handle all bug reports for this. Besides,
- you can use an external program.
-
- Your timezone is used to determine your location approximately
- when not specified, You can be a really poor approximation.
- It is too much work supporting summer time, especially when
- summer time is not necessarily +1 hour, additionally you can
- have scheme where it is first normal time, then summer time,
- then double summer time, then back to summer time, and the back
- normal time; complicated stuff, additionally, the Russian
- Federation is in permanent summer time. And have you heard about
- the People's Republic of China (not to be confused with the
- less known Republic of China,) they have one timezone, which is
- far from in the middle of the country. You can use an external
- program. To keep it simple, we are not even using your timezone
- to santity check your specified location.
-
-NOTES
- I suggest using a local script named radharc that sets all
- options for you.
-
-KNOWN ISSUES
- In X.org, the gamma ramps do not apply to hardware cursors,
- because the developers thinks it is the graphics drivers
- that shall fix this, and they are not accepting patches for
- this. You can use xorg-server-hwcursor-gamma, however, that
- patched version does not apply apply the gamma ramps until
- the cursor changes image. You can also use sortware cursors
- if this really bothers you.
-
- Wayland does not support this because it [Wayland] sucks.
-
- Haiku does not support this yet.
-
-SEE ALSO
- redshift(1), blueshift(1), redshift-adjust(1), nightshift(1),
- locateme(1)
-