This is a Reshade preset for Knights of the Old Republic 2. It attempts to improve the rather washed-out look of the game by deepening the colours, sharpening details and adding a number of additional graphical improvements such as ambient occlusion, SSR (screen space reflection) and more.
Comparison image: https://imgsli.com/NDM0NjQ
Ensure Reshade is installed and set-up for KOTOR 2 (via OpenGL). Extract the ini file to your KOTOR 2 folder, and select it via the Reshade menu when ingame. You can also tailor the preset to your liking.
Reshade is available here: https://reshade.me/