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Possibly because unless the paper size is A5 or A6, a PDF on an ereader makes no sense. Almost all the PDFs I have are old magasines or old text books and thus scans. I'll get an 11" approx eink if I'm ever rich. The DXG was a big disappointment.
I'll have a look at this on my Kindle keyboard and Kindle PW3 if I have time. I gave away the DXG to someone with macular degeneration, it's not as good as Kobo H2O original for PDFs, and it's too small and slow also for PDFs.
I've found if the PDF is discoloured and has a large margin it's worth importing to The Gimp as layers, setting resolution at import. Export as an animated png, process with imagemagik* to crop, set brightness, contrasts and threshold as 1 bit mono and then PDF is about 20x faster and might fit on the screen of a larger eink ereader like H2O or DXG.
[*Only change security on imagemagic to allow PDF export, not import]
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