The error regarding OpenJPEG's failure to decode JPEG2000 images can be resolved with the latest release of dcm2niix available at GitHub link. Another solution for MacOS is using the version of dcm2niix included in MRIcro (found in the Import menu) from NITRC MRIcroGL download.

Furthermore, I recommend avoiding JPEG2000 format for storage due to limited support, especially for 16-bit medical imaging. For better results, consider alternatives like HEIF format. Explore third party tool like JPEG Compressor for optional image formats and optimization.