Unlike standard image formats (JPEG, PNG), RTTEX files store data in a platform-optimized, often compressed or tiled layout (e.g., using Rockstar's proprietary compression like "XTB" or "NVIDIA DXTn"). They may also contain mipmaps (multiple resolution levels) and metadata for the game engine.
Standard image editors like Photoshop or GIMP usually won't recognize .rttex directly without a specific plugin. Stick to the specialized tools mentioned above. rttex to png
Why? DDS is another game-industry format that preserves all compression data. Converting DDS to PNG is trivial with any image editor. Unlike standard image formats (JPEG, PNG), RTTEX files
18;write_to_target_document1a;_gcLsaZn_JKyTwbkP_u2akA0_10;56; Unlike standard image formats (JPEG