The following is a draft of the updated DNG Converter command line documentation that we'll post on the official site before too long. Not all the options are available yet (esp. -lossyMosaicJXL and -losslessJXL), but the other JPEG XL related compression settings do work. There are many examples that I've added to the docs for typical use cases. For example, for high quality lossy, try: -dng1.7 -lossy -jxl_effort 7 -jxl_distance 0.1 [input file]
As an example for a source non-DNG Bayer file that is lossless compressed using the native format.
Original: 45 MB
Convert to DNG (lossless JPEG, prior to 1.7): 38 MB
Convert to DNG (lossy JPEG XL, effort 7, distance 0.1): 16.4 MB
Convert to DNG (lossy JPEG XL, effort 7, distance 0.2): 9.9 MB
Convert to DNG (lossy JPEG XL, effort 7, distance 0.3): 7.2 MB
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