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Originally Posted by dandan77
i have a lot of chess ebooks and math ebooks in pdf format i tried to watch them with my sony reader but the fonts are small and i cant see the charts or numbers ! can any one help me to solve the problem ???
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No really good answer, I'm afraid -- many, possibly even all, chess PDF books are designed to be printed in standard book sizes, and the PDF files and typefaces used reflect that: to read them on a Sony Reader means you have to zoom in, and then use some kind of pan-and-scan approach.
You may want to let the publisher / originator know about the problem: not all are aware of any need for mobile reading. They may be prepared to create new PDF releases targeted for small, bad-contrast screens, particularly if they're 'amateur publishers', and haven't got stuck on DRM issues. I dabble a bit in this field myself -- should any of the books you mention be something I have made, just let me know, and I'll probably be able to help out (see
http://www.algonet.se/~ath/ update: http://www.anders.thulin.name/SUBJECTS/CHESS_PROBLEMS/).
If you have to go the conversion route, you need to have the same chess typeface available on the reading system. (PDF embeds them, but in HTML or RTF, you need your own copy.) A useful web page for locating free chess typefaces is
http://www.enpassant.dk/chess/fonteng.htm . The Alpine typefaces (from
http://www.partae.com/) are not listed on that web page but are widely used. There are also other offerings: there are some old postings in rec.games.chess.misc (search
http://groups.google.com/ for 'chess fonts' or 'Linares font') covering other commercial alternatives, such as fonts from Adobe, Linotype and Agfa.
There is fairly small agreement on character set in the chess world, though: what's set in one typeface will not necessarily be possible to display in another -- unless they're from the same publisher: there will just be a jumble of random-looking glyphs. So you may have to match several typefaces to originals.