The High Quality Textures Mod improves visual quality of textures for other mods. RimWorld enables compression for mods’ textures, and there’s no option to alter this in base game. This makes some textures look horrifying at some zoom levels.
High Quality Textures Mod features
This mod disables texture compression to avoid that. It adds .dds support. If a mod contains a .dds texture with the same name as .png texture, the game will load .dds instead, making it possible for modders to use either higher quality mipmaps, or smaller files for better load times.