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How to display PDF in 6-inch e-books (the mainstream size of e-books at present) is a difficult problem. Because PDF is generally ready for printing, the format size is generally above 6 inches, and it is basically unclear when it is reduced to 6 inches. There are several possible ways: 1. If writing is the main thing, such as novels, the best way is to reorganize. Some e-books directly support PDF rearrangement reading. Kindle does not support direct rearrangement, and it needs to be rearranged in advance, such as word rearrangement. 2. If it is a scanned version or a picture (such as comics) or the layout is complicated, it cannot be rearranged (such as magazines, mathematical formulas, programs, etc.). ), then there is only white trimming. 3. In addition, in theory, some graphic enhancement functions can be used, such as increasing contrast, bold fonts, blank compression, etc. 4. If the original format reaches A4, the graphics enhancement mode can only be slightly improved. A more feasible method is to cut it into two pages and read it horizontally. But for complex pages, such as two-column and three-column pages (common in newspapers and magazines), simply cutting them into two pages will destroy the typesetting. Some methods to rearrange the software are to apply it according to several preset modes and then manually correct it. 5. The final solution is to recognize typesetting and rearrange it. This is feasible in theory and practice, for example, some OCR recognition software has certain format recognition ability. It just seems that there is no such rearrangement software specifically for PDF. Note: My last company made e-books. I try to suggest that the company invest resources in graphic enhancement and page recognition technology of e-book PDF reading. But from a big point of view, PDF is not a suitable format for e-books, and strategically, it is impossible for an enterprise like Amazon to invest resources in PDF (in fact, Kindle supports PDF direct reading very late), so ...