![]() ![]() I opened each file with Adobe Acrobat Professional, version 8.3.1 for Mac OS. The new file is 724,421 bytes, or 57% larger. Save As., and saved it under a new file name. One file, Giulio.pdf, is a 22-page document with text as text, not scanned images. This story applies to my computer, running Mac OS X 10.5.8 and Apple Preview 4.2 (469.5). I can, however, tell you what gets larger about some of my PDF files. It also matters what version of Mac OS X and Preview you are using, because that determine the software that writes the new PDF file when you do a Save As in Preview. It's likely that they were created by a variety of different pieces of software, some consise, some less so. We'd have to look at your exact PDF files. Just like one sentence might be concise and another verbose, but both are valid English and say the same thing, so too one PDF file might have a more verbose way of representing the same content as a more concise PDF file. A PDF file consists of many different kinds of data: images, content streams, fonts, document overhead, color spaces, extended graphics states, and a cross reference table. ![]() It's hard for anyone to answer why your PDF files are larger after Preview modifies them. Optimally encoded PDF files are all alike every sub-optimally encoded PDF file is sub-optimally encoded in its own way. In his little-known novel, PDF Karenina, Leo Tolstoy wrote, ![]()
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