In his little-known novel,, Leo Tolstoy wrote, Optimally encoded PDF files are all alike; every sub-optimally encoded PDF file is sub-optimally encoded in its own way. It's hard for anyone to answer why your PDF files are larger after Preview modifies them. 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. 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. We'd have to look at your exact PDF files. It's likely that they were created by a variety of different pieces of software, some consise, some less so. [3837850]; Problem: [Mac] The files in combine tool are lost and an error dialog. Problem: Advanced search is very slow on a document opened from the cloud. Adobe Photoshop's File → Save for Web & Devices opens a 'dialog window' which looks like this. On my laptop with a maximum screen resolution of 1280*720, the 'dialog window' is simply too big for the screen to show it fully. ![]() 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. I can, however, tell you what gets larger about some of my PDF files. This story applies to my computer, running Mac OS X 10.5.8 and Apple Preview 4.2 (469.5). One file, Giulio.pdf, is a 22-page document with text as text, not scanned images. It is 461,092 bytes large. I opened it in Preview, did File. Save As., and saved it under a new file name. The new file is 724,421 bytes, or 57% larger. I opened each file with Adobe Acrobat Professional, version 8.3.1 for Mac OS. I did Advanced. PDF Optimizer. Audit Space Usage. A small dialog box gave a break-down of how many bytes were due to each category of usage, plus the percent of the total file size for the category. The original Giulio.pdf has 390,754 bytes (84.75%) devoted to content streams, and zero bytes devoted to images. It is in the PDF 1.4 format. The file saved by Preview has 675,846 bytes (93.29%) devoted to content streams, also zero bytes of images, and is in the PDF 1.3 format. Preview made the content streams 285,092 bytes larger, and that represents 73% of the file size difference between the two. I wondered if the PDF 1.3 file format was inherently less efficient for storing this kind of file. I opened the original Giulio.pdf in Adobe Acrobat Professional 8, and did Advanced. PDF Optimizer. Make compatible with: Acrobat 3.0 and later and pressed OK. I saved the resulting file under a new name. The resulting file is in the PDF 1.3 format, and was 452,356 bytes, or smaller than the original.
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March 2019
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