Noesis is a universal asset viewer and converter. It supports RTTEX from many GIANTS Engine games. It offers a point-and-click interface, and you can export frames to PNG. Noesis is excellent for viewing textures before conversion.
RTTEX files are often highly compressed (e.g., DXT5 at 4:1 or 8:1 ratio). A lossless PNG will be than the original RTTEX. If disk space is a concern, consider converting to DDS (DirectDraw Surface) instead, which retains the original GPU compression. rttex to png
RTTEX files contain engine-specific metadata (e.g., compression type, texture flags, anisotropic filtering hints). PNG does not support this metadata. If you convert to PNG and later convert back to RTTEX, the game may reject the file. Noesis is a universal asset viewer and converter
raw_data = f.read(width * height * bytes_per_pixel(format_id)) img = decompress_dxt(raw_data, format_id, width, height) img.save(out_path, "PNG") Noesis is excellent for viewing textures before conversion