Both grabScreen() and saveViewport() resolution issue on windows

Hi,
I’m working on an application written under linux, that will be in production under windows.

Note that the windows machine as a GeForce GTX 1080, with a screen resolution set at 1920X1200.

At a moment, I export the image generated by my app (in a window of 4096X4096px) with :

fft->before.grabScreen(0, 0 , 4096,4096);  
//then (...)
fft->before.save("cut_simulation.png");

Under linux, the result is good (see attached file) Good export from linux

but on windows, the result is a picture in picture bad, but with a global resolution of 4096X4096, that is ~ok. win bad grabScreen

I try an alternative with

ofSaveViewport("cut_simulation.png");

Under linux, the result is the same (good)

but on windows, the result is a picture with a resolution near but not egal with the screen resolution : Windows saveViewport
This image as a resolution near the screen resolution but not egal (!)

Anybody knows how to solve this ?

thanks

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