How to take High Resolution Screenshots? (Higher than native res)

[VibronicJumper]

Specifically speaking I am trying to render the game FTL at a higher resolution that what my native resolution is (1920x1080)
Though this applies to any game so maybe someone can help.
I am able to run the game in windowed mode at a resolution of 7680x4320 and can take a screen shot of the main menu, BUT I can not see most of the image on screen while playing the game because the window becomes larger than the screen itself, therefore preventing me from controlling the game and taking screenshots other than the main menu.

is there a better way to go about this or something I can do to allow me to play while at a resolution such as this?

Thanks for any help in advance.
screen_x=7680
screen_y=4320

 

[Cons29]

wel, it is larger than your screen so it will be like that. otherwise it will not be a high(er) reso screenshot if it was smaller. at 1:1 pixel then it will be on the native reso, giving it a higher resolution will result in what you have now.
sorry, but i do not think it's possible at the current setup

 

[VibronicJumper]

wel, it is larger than your screen so it will be like that. otherwise it will not be a high(er) reso screenshot if it was smaller. at 1:1 pixel then it will be on the native reso, giving it a higher resolution will result in what you have now.
sorry, but i do not think it's possible at the current setup

Just to be clear, I CAN take screenshots at this res while running the game. I just havnt found a way to be able to see the entire game to be able to control it.