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@@ -0,0 +1,104 @@ +NAME + radharc - Adjust display colour temperature after the Sun + +SYNOPSIS + radharc [-M method] [-S site] [-c crtc] ... [-R rule] [-p priority] [-f fade-in] + [-F fade-out] [-h [high-temp][@high-elev]] [-l [high-temp][@high-elev]] + (-L latitude:longitude | -t temperature [-d] | -x) + +DESCRIPTION + radharc adjusts the colour temperature of your monitor according + the the elevation of the Sun. This is intended to reduce eye strain + reduce deplayed sleep phase syndrome. + + radharc is inspired by redshift(1) but uses libcoopgamma(7) to allow it + to be used alongside other programs that also modify the monitors + colour output, as long as the also use libcoopgamma(7). + +OPTIONS + The following options are supported: + + -c crtc + Apply the filter to the CRTC with the monitor whose EDID is crtc. + By default, the filter is applied to all monitors. + + If crtc is '?', all available CRTC's are listed. + + -d + Keep the process alive and remove the filter on death. + + -f fade-in + Set effect fade-in time (gradual application when the program + starts). The value is interpreted a real number of seconds. + + -F fade-out + Set effect fade-in time (gradual restoration when the program + stops). The value is interpreted a real number of seconds. + + -h [high-temp][@high-evel] + Selects that the colour temperature shall be high-temp + Kelvins when the Sun's elevation is high-evel or higher above + the horizon. + + This option only has effect when combined with the -L option. + + -l [low-temp][@low-evel] + Selects that the colour temperature shall be low-temp + Kelvins when the Sun's elevation is lower-evel or lower above + the horizon. + + This option only has effect when combined with the -L option. + + -L latitude:longitude + Selects the location the Sun's elevation shall be calculated + for. The program will run until it is manually terminated and + continually readjust the colour temperature according the + the Sun's elevation. The latitude and longitude shall be + specified in decimal format. Positive numbers shall be used + GPS coordinates north of the equator and GPS coordinates + east of the prime meridian. Negative number shall be used + for GPS coordinates south of the equator and GPS coordinates + west of the prime meridian. + + -M method + Adjustment method name or number. Recognised names include: + dummy Dummy method + randr X RAndR + vidmode X VidMode + drm Linux DRM + gdi Windows GDI + quartz Quartz Core Graphics + + The adjustment methods are supported via libgamma(7). Only methods + that were enabled when libgamma was compiled will be supported. + + If method is '?', all available adjustment methods are printed. + + -p priority + Set the priority of the filter. Filters with higher priority + are applied before filters with lower priority. The value must + be a signed 64-bit integer (between -9223372036854775807 and + 9223372036854775807). radharc's default priority is + -2305843009213693952. + + If priority is '?', the utility's default priority is printed. + + -R rule + Set the rule of of the filter to rule. This is the last part of + the filter's identifier (class). The default rule is standard. + + -S site + Select the site to which to connect. For example ':0', for local + display 0 when using X. + + -t temperature + Colour temperature, in Kelvins, to apply. + + -x + Remove the currently applied filter. + +OPERANDS + No operands are supported. + +SEE ALSO + coopgammad(1), cg-tools(7), redshift(1), blueshift(1) |