|
Conversion of PDFs can be erratic. Only a high CPU power Android tablet or iPad at 10" or better will allow quick PDF viewing.
The Kobo Libra quick page turn etc is much faster than the original H2O or a Kindle PW3, but only for epub2 (or epub2 related kpub).
There really four sorts of families of PDF:
1) Actual Postscript text based. If you can copy and paste text and the result matches the original.
2) Vector based Postscript or a Vector based drawing in a PDF wrapper. Not usually text.
3) Scans encapsulated in a PDF wrapper. There might be a TOC. You can only copy/export an image of the text.
4) Scans with an OCR layer. The OCR allows easy building of a TOC and search. A copy and paste either fails or gives you the rather inaccurate pre-created OCR.
Only Type 1 will turn pages at a reasonable speed and only Type 1 can be converted.
The Type 2 can't be converted to any sort of ebook without rasterising it. It can be fast or painfully slow depending on the complexity, basically like CAD, Schematics or Inkscape in a multipage PDF wrapper.
Type 3 and 4 is as slow as loading high resolution images or worse.
PDF is a wrapper and a spec. It can have text, static bitmaps, or static vectors and even multiple layers of those per page as well as all the needed fonts. It's a kind of superset of Postscript.
|