Manipulating single LCD pixels
Hi, I've looked around for a program that can manipulate single pixels on the screen directly. Like if you would type in some RGB values and the position of the pixel then that pixel would change. Why you might ask? Well besides programming, I play games alot. The games aren't perfect so someteimes the crosshair "disappears" against a bright surface in the game. I simply want to improve this by shutting off pixels in the center of the screen. Or perhaps make a completely new crosshair if it's possible.
I didn't find any program that does this, though if you know of such a program then tell me! Otherwise I will try to program one on my own. In that case I wonder if it's even possible to use an API since the pixels will have to be dead regardless of what other programs/games are using the screen. I suspect this would have to be done by communicating with the screen on a lower level, but I'll glad if I'm wrong! So can anyone point me in the right direction?