Added after 40 minutes
Here's another thing. My highest original resolution is 1366x768, but below it, it shows 1067x600. When I select the latter and change the filter in the game, I can see the difference. I realized that the difference is in sharpness and blurriness; some filters blur the image, making it less "sharp," but at the same time, the clarity of the outline disappears. But for some reason, when I use my maximum resolution of 1366x768, the filters don't change visually. And also, for some reason, Fraps doesn't detect the game, even though the full-screen button is enabled.