Actually, that doesn't matter all that much. You ought to scan it into a TIFF file and then process it the way you want it. If you want a good JBIG2 compressor

Actually, that doesn't matter all that much. You ought to scan it into a TIFF file and then process it the way you want it. If you want a good JBIG2 compressor according to your liking, you have to write it yourself anyway, I don't think that the printer hardware and SW is up to that task. The idea is actually very smart: given the infinite (and multidimensional) space of encoder solutions, fixing the bit encoding and the decompression process was very smart. It's like with PDF: it's well defined how to draw it into a bitmap but you're not constrained as to how you generate the layout, what line break algorithm you use etc.