You can adjust the DisplaySettings.xml file, often located in Documents\My Games\Sleeping Dogs\Data , to manually push settings beyond the in-game menus. Comparison: HD Textures vs. Base Game
Always ensure you have backups of your original game files before experimenting with community mods. You can adjust the DisplaySettings
Provide a quick fix for the "purple tint" issue in the Definitive Edition You can adjust the DisplaySettings.xml file