QT scaling - Ways to change Environment Variables in Windows

[Comfy.n]

Hi, I've put together some batch commands that should help users address Qt undesired scaling annoyances.

As noted by thiago.eec here, both QT_SCALE_FACTOR_ROUNDING_POLICY = Round and QT_ENABLE_HIGHDPI_SCALING = 0 will work.

There's also a nifty 3rd party utility mentioned by BetterRed.

And here's the path that will work on a shortcut to the native Windows Environment Variables dialog box (needs elevation), where the variables should be added to System Variables:

%windir%\System32\rundll32.exe sysdm.cpl,EditEnvironmentVariables

Files in the attached zip archive are:

• 1 - QT_Rounding_Policy.cmd
• 2 - Restart_explorer.cmd
• alternative - QT_disable_DPI_scaling.cmd
• UNDO_variable_insertions.cmd

The second batch file can be used to restart Windows Explorer, as that's enough for the changes to take. (then, of course, restart Calibre)

[PeterT]

Are you aware of the windows SETX command that can manage the system environment variables?

See https://docs.microsoft.com/en-us/win...-commands/setx

Sent from my Pixel 4a using Tapatalk

[Comfy.n]

Originally Posted by PeterT

Are you aware of the windows SETX command that can manage the system environment variables?

See https://docs.microsoft.com/en-us/win...-commands/setx

Sent from my Pixel 4a using Tapatalk

uhum, that's what I'm using on the batch files in the zip

credits:

https://stackoverflow.com/questions/...h-a-batch-file

https://superuser.com/questions/1245...h-a-batch-file

I forgot to add that this Windows setting seems important to check out, as well, noting that each use case might require a different setting, as DNSB reported here:

https://superuser.com/questions/1230...e-command-line

[PeterT]

oops.sorry. I'd seen the command to invoke the sysdm.cpl and had assumed thatyour batch file was using it

[Comfy.n]

Originally Posted by PeterT

oops.sorry. I'd seen the command to invoke the sysdm.cpl and had assumed thatyour batch file was using it

np

and thank you for the reference to the setx documentation!

BTW, new Calibre 6.3 version is available, wheeeeeeee