How to read color and picture from application?

Question

reverse engineering

Hello, the question is how to read from the application (game) the color of a certain pixel and some kind of image to check for matching elements.
Yes, I want to make a bot. Plans for studying how to work with the application's memory (if anyone fumbles in this, I'll be happy to contact you in general), but first I want to practice writing its logic.

The first step is to quickly read the color of a specific application pixel and return its value. Methods in c# (winapi) are interesting, well, just look at python. The check should be as fast and asynchronous as possible. Google gave the maximum information from the 13th year, I wonder how they do it now, because it seems that Sharp has been greatly improved not so long ago. If anything, the cars will be only x64.

Answer 1

Web game or app?
If you don’t get into memory, then you can screen the screen and check the pixel, if 3 is unlikely or something like that, then you can screw opencv and search for objects by patterns comparing them.
If the web then inject js.