Quote:
Originally Posted by dwig
Many PDF books = problems when using a small screen device since many (most?) are created for printing on standard letter size paper or printing as a standard size book. This is a particular problem with textbooks where the page is relatively large in the printed version and the text is laid out in two or more columns.
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On the contrary, two-column A4/letter sized pdf (for both scanned or vectorized text) is usually easier to read on small screen devices because such device usually features 2-column or multi-column zooming mode, and single column fits 6" portraite screen nicely (takes 4 screens per page).
A4 pdf without columns is a lot bigger problem, because if it is scan without OCR layer its letters shall be too small on 120 mm landscape 6" screen for any pleasant reading, or if it has OCR layer or is textual pdf, then using reader's own pdf reflow mode (if existed) shall result in deleted pictures, lost layout, probably slower page flipping and OCR errors (because readers usually show reflowed ocr layer not reflowed scanned picture itself).
Luckily there is a good solution for reading A4 scans or pdf vectors on any 6" or 7" e-ink or lcd reader and it's called k2pdfopt app.
http://www.willus.com/k2pdfopt/
https://www.youtube.com/watch?v=gcm5...4GtE5XPpWS5rOP
It reflows scanned picture itself (not just the ocr layer behind it), retains pictures and tables minimally changing pdf layout, allows for different size of letters, and last but not least, pdf flipping shall not be slower but a lot faster because reader doesn't have to compute anything but just to show perfectly tailored pdf pages for its size, resolution and orientation.