## Requirements: 
##    Windows >=10 
##    Python (installed normally as a Windows program; not part of Windows Subsystem for Linux)
##    win_magnification package (install using "pip install win_magnification"s)
## Run through a command prompt window, as in:
##    python.exe invert_colors.py

import win_magnification as mag

mag.initialize()
## The next command flips the blue and the red channels. 
## It uses a 5*5 matrix specifying the linear transformation applied to the colors. 
## The order is (R,G,B,alpha,constant), the latter being used to implement affine transformations.
mag.set_fullscreen_color_effect((0,0,1,0,0, 0,1,0,0,0, 1,0,0,0,0, 0,0,0,1,0, 0,0,0,0,1))
print("Press ENTER to restore original colors")
input()

# These are apparently not needed, since Windows restores colors upon exiting
#mag.reset_fullscreen_color_effect()
#mag.finalize()