I have been playing around with the different transfer syntaxes available and realized that for jpeg2000, the different syntaxes 90-93 result in identical, rather large filesize. So it seems that all images are compresses lossless. I compared the file sizes to those compressed with weasis and they match exactly with syntax 90 of weasis, so lossless jpeg2000 compression. Am I missing some additional configuration option to enable lossy j2k compression? Already tried the ORTHANC__DICOM_LOSSY_TRANSCODING_QUALITY in my orthanc.yml, but this has only an effect on regular jpeg compression (syntax 51).
Thanks for your insights and advice,