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Old 11-05-2021, 09:43 PM   #47
retiredbiker
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Posts: 451
Karma: 3886916
Join Date: May 2013
Location: Ontario, Canada
Device: Kindle KB, Oasis, Pop_Os!, Kobo Forma
Quote:
Originally Posted by ownedbycats:
Also, what is up with Internet Archive's PDF compression? It rarely renders correctly on my Kobo, and instead I just get an image of text smudges. Even on my PC it's slow to render.
If you run pdfimages on one of these, you get out all sorts of crap. Black images, images of blurry smudges, images of real text, often inverted to white on black. Formats are mostly .ppm and .pbm. Without going into detail, I use ImageMagick, mostly, to end up with just the images I want. I read somewhere that the non-text images are masks, but I have no idea how a pdf uses them. I haven't seen this elsewhere, only from IA.

I've never tried one on my Kobo. They display well in my PC's Document Viewer. Sounds like the Kobo is displaying those blurry smudgy ones.
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