Awesome

`wl-gammarelay-rs`

Like wl-gammarelay, but written in rust, runs on a single thread and has zero runtime dependencies.

Dbus interface

$ busctl --user introspect rs.wl-gammarelay / rs.wl.gammarelay
NAME               TYPE      SIGNATURE RESULT/VALUE FLAGS
.ToggleInverted    method    -         -            -
.UpdateBrightness  method    d         -            -
.UpdateGamma       method    d         -            -
.UpdateTemperature method    n         -            -
.Brightness        property  d         1            emits-change writable
.Gamma             property  d         1            emits-change writable
.Inverted          property  b         false        emits-change writable
.Temperature       property  q         6500         emits-change writable

Installation

From Source

cargo install wl-gammarelay-rs --locked

Status bar integration

i3status-rust

i3status-rust hueshift block has the builtin support for this backend since 0.21.6.

Waybar

    "custom/wl-gammarelay-temperature": {
        "format": "{} ",
        "exec": "wl-gammarelay-rs watch {t}",
        "on-scroll-up": "busctl --user -- call rs.wl-gammarelay / rs.wl.gammarelay UpdateTemperature n +100",
        "on-scroll-down": "busctl --user -- call rs.wl-gammarelay / rs.wl.gammarelay UpdateTemperature n -100"
    },
    "custom/wl-gammarelay-brightness": {
        "format": "{}% ",
        "exec": "wl-gammarelay-rs watch {bp}",
        "on-scroll-up": "busctl --user -- call rs.wl-gammarelay / rs.wl.gammarelay UpdateBrightness d +0.02",
        "on-scroll-down": "busctl --user -- call rs.wl-gammarelay / rs.wl.gammarelay UpdateBrightness d -0.02"
    }
    "custom/wl-gammarelay-gamma": {
        "format": "{}% γ",
        "exec": "wl-gammarelay-rs watch {g}",
        "on-scroll-up": "busctl --user -- call rs.wl-gammarelay / rs.wl.gammarelay UpdateGamma d +0.02",
        "on-scroll-down": "busctl --user -- call rs.wl-gammarelay / rs.wl.gammarelay UpdateGamma d -0.02"
    }

Note: make sure wl-gammarelay-rs is in your PATH at the time waybar is launched, or use the full path to the binary.

wl-gammarelay-applet

wl-gammarelay-applet is a small desktop applet for controlling wl-gammarelay-rs.

Watch for changes

You can run wl-gammarelay-rs watch <format> to watch for changes. Each time some property changes, a new line will be printed based on <format> string. {t} expands into temperature, {b} into brightness (0 to 1) and {bp} expands into brightness in percents (0 to 100).

For example, if you want to monitor both temperature and brightness (in percents), you can run

$ wl-gammarelay-rs watch "{t}K {bp}%"
4000K 90%
4500K 90%
5000K 90%
5000K 100%
5000K 80%
5000K 100%
...

Example usage in scripts

# Set the temperature to `5000`
busctl --user set-property rs.wl-gammarelay / rs.wl.gammarelay Temperature q 5000

# Increase the temperature by `100`:
busctl --user call rs.wl-gammarelay / rs.wl.gammarelay UpdateTemperature n 100

# Decrease the temperature by `100`:
busctl --user -- call rs.wl-gammarelay / rs.wl.gammarelay UpdateTemperature n -100

# Invert colors
busctl --user set-property rs.wl-gammarelay / rs.wl.gammarelay Inverted b true

# Toggle inverted colors
busctl --user call rs.wl-gammarelay / rs.wl.gammarelay ToggleInverted

# Set the brightness to `100%`:
busctl --user set-property rs.wl-gammarelay / rs.wl.gammarelay Brightness d 1

# Increase the brightness by `10%`:
busctl --user call rs.wl-gammarelay / rs.wl.gammarelay UpdateBrightness d 0.1

# Decrease the brightness by `10%`:
busctl --user -- call rs.wl-gammarelay / rs.wl.gammarelay UpdateBrightness d -0.1

# Set display gamma to `1.0`:
busctl --user set-property rs.wl-gammarelay / rs.wl.gammarelay Gamma d 1

# Increase gamma by `0.1`:
busctl --user call rs.wl-gammarelay / rs.wl.gammarelay UpdateGamma d 0.1

# Decrease gamma by `0.1`:
busctl --user -- call rs.wl-gammarelay / rs.wl.gammarelay UpdateGamma d -0.1

With multiple outputs

Each connected output is listed under /outputs and its properties can be seen and edited separately. For example, a laptop with an internal "eDP-1" monitor and a "HDMI-A-1" output has the following DBus objects:

$ busctl --user tree rs.wl-gammarelay
└─ /outputs
  ├─ /outputs/HDMI_A_1
  └─ /outputs/eDP_1

You can operate on a specific output using its object path:

# Set the temperature to `5000` for the HDMI output
busctl --user set-property rs.wl-gammarelay /outputs/HDMI_A_1 rs.wl.gammarelay Temperature q 5000

# Set the temperature to `9000` for the internal monitor
busctl --user set-property rs.wl-gammarelay /outputs/eDP_1 rs.wl.gammarelay Temperature q 9000

When there are several outputs, the values shown are:

for the brightness, temperature and gamma, the average of all outputs' values
for the inverted boolean, true if all outputs are inverted and false otherwise

When updating the brightness, temperature or gamma value, the modification is applied to each output:

# Get the values
$ busctl --user -- get-property rs.wl-gammarelay /outputs/eDP_1 rs.wl.gammarelay Brightness
d 0.7
$ busctl --user -- get-property rs.wl-gammarelay /outputs/HDMI_A_1 rs.wl.gammarelay Brightness
d 0.5

# Update all outputs
$ busctl --user -- call rs.wl-gammarelay / rs.wl.gammarelay UpdateBrightness d 0.05

# Get the values again
$ busctl --user -- get-property rs.wl-gammarelay /outputs/eDP_1 rs.wl.gammarelay Brightness
d 0.75
$ busctl --user -- get-property rs.wl-gammarelay /outputs/HDMI_A_1 rs.wl.gammarelay Brightness
d 0.55

When toggling the inverted status:

if all the monitors are inverted, then all of them are reverted to normal
otherwise, all monitors are made inverted, even if they already were inverted