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When a PDF is properly formatted, when sentences are structured like sentences, and when it's a simple PDF like a book without tables and pictures, it works. Sometimes you see a PDF where the end of a line of text means the end of a paragraph structure wise. And if you choose to use a bigger font, the text flow changes and sentences break halfway, leaving a half empty line, etc. When this happens once every two or three pages, not a problem, but if this happens all the time it makes the book unreadable. This happens quite a lot at the ending of a page as well. If you have something like a sidenote or footnote, it is very likely that it breaks up the textflow, and not in a nice way, after a paragraph, but it breaks up a sentence. This can be very confusing, especially if you're reading in a different language with complex sentences. Then there is another level of breaking up a sentence halfway, where words are not formatted as words, but as letters, and where each line breaks up words. I've seen this with a O'Reilly book. They fixed this within a week, so that was excellent service, but it shows how this can work. Images can be a problem, depending on their size. Most ereaders are underpowered and can have difficulty processing large images. Tables will be mess in 99% of the cases, because they consist of text and lines, and do not have any structure. It's always a surprise how they will show up. It could mean that half of the table is not even shown, or column one is shown, below that column 2, and you don't see the relation anymore. Sometimes column 2 is partly shown before column 1. Some PDFs simply crash the ereader program. |