pythonwindowsspyderdpihighdpi

HIGH DPI Tkinter re scaling when I run it in Spyder and when I run it direct in terminal

this is probably not much of a coding question.

I developed an application in Tkinter which consists pretty much in a canvas where I load images on (matplots).

When I run it from Spyder or Jupyter notebook I obtain 143 DPI and when I run it directly in terminal I obtain 95 DPI instead.

The most weird thing is that once I run it from terminal it shows as if it was a 143 DPI application but when I load the image the app decides to resize completely and then change the DPI of my screen. So the whole thing resizes, buttons, pop up boxes and etc...

It is very important to me that I can run it from terminal, because afterwards I will transform it into a .exe application.

My first approach was to use the tkinter method .winfo_fpixel() and try to ratio the DPIs and multiply it to every dimension in the application.

Later I tried to find python.exe and pythonw.exe in order to change the compatibility with HIGH DPI Scale.

Do you thing there is a way to solve this without resizing everything?

I would like to insist that I'm 100% sure this has nothing to do with the code, therefore I might not post any coding samples.

Thanks.

obs: I use Windows 10 ps: I tried to run the app with two screens, what happened was really funny, when I use it on an adequate screen it runs normally, but when I slide it to the other screen and make any action/event it will resize it automatically.

Solution

  • selbie's answer is correct.

    Also,You could use winapi to set DPI aware in python directly(this could work in tkinter):

    import ctypes, tkinter
try: # >= win 8.1
    ctypes.windll.shcore.SetProcessDpiAwareness(2)
except: # win 8.0 or less
    ctypes.windll.user32.SetProcessDPIAware()

root = tkinter.Tk()
....

    MSDN doc: SetProcessDpiAwareness, MSDN doc: SetProcessDPIAware

    And this is another answer which mentioned about DPI awareness.