Windows - AMD Graphics

https://ledstrain.org/d/80
Find your registry path (in Catalyst Control Center, go to preferences->advanced->Information->Software)
Run regedit, browse to that path.
Look for the target key, which is either 0000 or 0001 (or both, if you have enough outputs). Make a new 32-bit DWORD:
```
DP_DisableDither=1    if you have DisplayPort connection
TMDS_DisableDither=1  if you have DVI connection
HDMI_DisableDither=1  if you have HDMI connection
```
Reboot.

Windows - nVidia Graphics

Windows - Intel Graphics

Windows - Microsoft Standard VGA Adapter

Linux - AMD Graphics

There are 2 ways to disable dither:

https://ledstrain.org/d/413/13
If you're using the open source Radeon driver, type command xrandr --prop to get display name as well as the name of dither option:
```
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
HDMI-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 353mm x 198mm
        EDID: ... ...
        dithering:      Off
```
Turn off dither by command:
```
xrandr --output HDMI-1 --set "dithering" "off"
```
Replace "HDMI-1" and "dithering" with what you get in xrandr --prop.

Linux - nVidia Graphics

There are 2 ways to disable dither:

https://nouveau.freedesktop.org/wiki/Dithering
If you're using the open source driver "Nouveau", type command xrandr --prop to get display name as well as the name of dither option:
```
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
HDMI-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 353mm x 198mm
        EDID: ... ...
        dithering:      Off
```
Turn off dither by command:
```
xrandr --output HDMI-1 --set "dithering" "off"
```
Replace "HDMI-1" and "dithering" with what you get in xrandr --prop.
May not work in linux kernel newer than 4.13.xx.

https://help.teradici.com/s/article/1048
If you're using the proprietary driver, switch to runlevel 3 using telinit 3 command.
Log in to root account.
Add the line into X config file (/etc/X11/xorg.conf).
```
Section "Screen"
Option "FlatPanelProperties" "Dithering=Disabled"
EndSection
```
If you're using older nVidia driver versions, add the lines instead
```
Section "Screen"
Option "Dac8Bit" "False"
Option "RegistryDwords" "DitherAlgo8DitherAlgo8=3; DitherAlgo6=3"
EndSection
```
Note that if this configuration doesn't turn off dithering, you might disable dithering by only setting the Dac8Bit to True, but including second option will turn off dithering algorithm in most Linux distributions.
Save changes.
Switch back to runlevel 5 using telinit 5 command.

Mac OS - ...

No way.