There is a possibility right now that delivers also quite small files using lossy compression.
Just use Adobe DNG Converter with lossy compression on your normal PureRAW DNG’s.
I have tested it with a 70 megabyte DNG produced in PureRAW 4.0 and after using Adobe DNG Converter, the resulting DNG file was less than 8 megabytes; also I could see almost no difference from the original.
Important note: for darktable to read it at the present time, the compatibility chosen on the converter has to be “Camera Raw 14.0” or less (the newer 15.3, and 16.0 use “jpeg xl”, and darktable is not able to read them yet).
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