How to invert colors of a specific application, or window, only using Magnifier

The magnifier allows a user to invert the colors of the entire Desktop.

Does anyone know how to invert the colors of just an application, or a specific window?

There are only three modes that Magnifier works in, and the high contrast colour inversion only works in conjunction with these modes. These modes are listed in the Microsoft page Make items on the screen appear bigger (Magnifier):

There are three Magnifier modes:

• Full-screen mode. In full-screen mode, your entire screen is magnified. Depending on the size of your screen and the zoom level you choose, you might not be able to see all of the screen at the same time.

• Lens mode. In lens mode, the area around the mouse pointer is magnified. When you move the mouse pointer, the area of the screen that's magnified moves along with it.

• Docked mode. In docked mode, only a portion of the screen is magnified, leaving the rest of your desktop unchanged. You can then control which area of the screen is magnified.

So to achieve what you require, you will have to use in Docked mode, specifying a region occupied by a window (adjust the window to your particular tastes beforehand). Unfortunately you can not thereafter move the window and expect the magnifier to follow it, but you can always "re-dock" the magnifier to the new window position. Not ideal, but better than nothing.

This is the manner in which I use it. Hope this helps.

EDIT: This uses a third party program. Not exactly what OP asked, but it's better than nothing.

There's a program called Easy Invert and it can apply a number of color filters if the specified programs/windows are maximized, and auto mode is turned on.

By default, the program will apply the grayscale filter, but you can change it to Invert colors on the settings (Tray Icon -> Filter Type -> Invert)

The program is portable, and you have to left click it's icon on the tray area to set your settings. It has a key feature called auto mode. This feature will activate/deactivate the selected filters if any of the specified software (executable?) or windows is maximized.

Just note that for the program to work you need to have Windows 10 >= Windows 10 Fall Creators Update

and for all the paranoid users out there, it has 0/69 detections on Virus Total

Lastly, WARNING FOR EPILEPTIC USERS: Since the program takes some miliseconds to apply the color filters, the rapid color changes might trigger your condition. You've been warned.

windows+"+" ==> ctrl+alt+f ==>ctrl+alt+I that's pretty close to what you want but, it ivert the whole screen color, back to normal mode just close the magnifer or press ctrl+alt+I again