Brightness changer + OSD

Brightness.ahk


; Version: 2022.11.17.1
; Usage and examples: https://redd.it/owgn3j

Brightness(Offset) {
    static last := ""
    wmi := ComObjGet("winmgmts:\\.\root\WMI")
    if (last = "") {
        last := wmi.ExecQuery("SELECT * FROM WmiMonitorBrightness")
            .ItemIndex(0)
            .CurrentBrightness
    }
    DetectHiddenWindows On
    hWnd := DllCall("FindWindowA", "AStr","NativeHWNDHost", "Ptr",0, "Ptr")
    PostMessage 0xC028, 0x037,,, % "ahk_id" hWnd
    brightness := Min(100, Max(0, last + Offset))
    if (brightness = last)
        return
    last := brightness
    wmi.ExecQuery("SELECT * FROM WmiMonitorBrightnessMethods")
        .ItemIndex(0)
        .WmiSetBrightness(0, brightness)
    ObjRelease(wmi)
}

automatically regulate

Is completely out of the scope (this is for manual adjustment). Most likely there should be tools for that, and others that overlap with HDR stuff.

Thanks so much, you were right and now I no longer need to bother with the javascript bookmark!
There is one chrome extension that does this: "Sites Dimmer - sharp brightness reduction". Paired with "Dark Reader" it does an amazing job.
I'm now using "Dark Reader" to affect only several websites that I've configured it for and I made sure that "Sites Dimmer - sharp brightness reduction" wasn't affecting those, but any other website with bright colors will be set to 85% brightness automatically.
Why I'm still using "Dark Reader" is b/c I quite like the custom dark theme that I have for some websites. So using both is really nice.