How to Convert Read Only Files in Matlab
Many ebook readers natively back up PDF documents just, unfortunately, not all PDF documents are easy to read on a small ebook reader screen. Allow's accept a look at two unproblematic and free ways to catechumen PDF files for enjoyable reading.
Kindles, Nooks, Sony Pocket Readers, and other popular readers support native PDF rendering. The problem with native rendering, however, is that many PDF documents are formatted to be read on a large screen or printed and read in hard re-create. Large margins, multiple columns, and other formatting choices that aren't such a large deal when the document in printed on 8.5×11 newspaper or displayed on a twenty″ monitor render the document almost unreadable when loaded into an due east-reader with a six″ screen. Today we're going to look at 2 ways you tin re-format a PDF file for enjoyable reading on your favorite reader.
What You'll Need
For our tutorial you'll need the post-obit things:
- A re-create of ebook management software Calibre.
- A copy of K2pdfopt.
- A PDF file to convert.
- An e-reader to endeavor the file out on.
Nosotros suggest keep a make clean copy of your PDF test file in a divide directory so if all your conversion attempts get amiss yous'll have the original safe and audio.
Converting Using Calibre
Calibre is an crawly and open source ebook management tool. If you've read this far and have no intention of even mucking around with any PDF files y'all should go and download it regardless. It's a fantastic tool for managing ebooks and ebook readers. What we're interested in, book management aside, is the conversion tool built into Calibre.
If you're totally new to using Calibre and demand help installing it and getting your books into information technology, check out one of our previous Calibre-based guides to get started. Once you've installed it and you've loaded upwardly a volume y'all want to convert it's time to become converting.
For our example nosotros'll exist using a specially complex textbook (multiple columns, charts, graphic headers for each chapter, etc.) and a Kindle. First let'due south look at what the original PDF file looks like on the Kindle screen.
That'southward eye-squintingly small on a large monitor screen and nearly illegible on a Kindle screen. There'due south no fashion we could comfortable read that on a 6″ kindle screen without serious eye strain and a headache. Allow'southward see if we tin can convert information technology with Calibre.
Open Calibre and right click on the book. Select Catechumen Books –> Convert individually. Here you'll detect an enormously detailed menu with toggles and settings galore. It's easy to get overwhelmed and some of the settings are pretty arcane if you're unfamiliar with press terms and/or search string expressions. For the kickoff conversion stick with the default settings and convert between PDF and a suitable format for your ebook reader or even PDF to PDF to restructure multi-column PDF files into a more streamlined document.
When it'due south done converting you can check the formatting on your figurer by double clicking on the converted file in the correct hand book information column or you tin transfer it to your device. Nosotros transferred it to the device to get a real sense of how it looked on the page.
Although we've used Calibre to convert hundreds of ebooks over the final few years with very few issues this detail PDF file proved to be a real challenge for it. The multiple columns, odd formatting choices, and other factors really stumped Calibre.
While Calibre ordinarily does a fine job converting PDF files we picked ane of the nigh hard to convert PDFs nosotros had on mitt to demonstrate that things don't e'er go as planned. We also picked a really hard to convert PDF and so that nosotros could in turn show off the adjacent tool in our tutorial, K2pdfopt. Information technology's like the nuclear choice when the normally reliable Calibre fails to crank out a working conversion. If you find yourself in a similar boat, your complex PDF document didn't turn out correct, yous'll likely exist thrilled with K2pdfopt.
Converting Optimizing PDF files using K2pdfopt
First, nosotros want to requite a big cheers to Abhijeet at Guiding Tech; nosotros'd been looking for a tool like this and he tipped u.s. off at just the right time. K2pdfopt is designed to optimize PDF documents for small screen e-readers. Rather than catechumen the document into raw text and attempt to reformat information technology, it instead advisedly crops and realigns the pieces as though they were a series of images. The end event is a new PDF file that is actually true to the original document and free from odd OCR blunders (as it doesn't attempt to convert or reflow the text).
Using K2pdfopt is a snap. Extract the executable into a folder, elevate a PDF file onto the EXE and let information technology work—as seen in the screenshot higher up. Nosotros dropped the same difficult to format textbook PDF into K2pdfopt and crossed our fingers. Given how much Calibre struggled with the document we weren't sure what to expect. When the conversion completed (you'll see a copy of your PDF file with the file named annotated similar filename_k2opt.pdf in the K2pdfopt folder) nosotros copied it over to our Kindle and were shocked at how well information technology handled the complex text we threw at it. 
The text is slightly less crisp than in our PDF to MOBI conversion (see the screen capture in the Calibre section) but it is all there, with proper formatting, and without any screwy OCR errors. Thanks to K2pdfopt we went from having a PDF that was illegible on the Kindle to having a PDF that was equally easy to read as a clean photocopy.
The only downside we could find in using K2pdfopt was the increase in file size. A 15MB PDF file, when converted with K2pdfopt, ballooned to 93MB. When you consider how few conversions Calibre doesn't properly handle and how few books we'd need to really transport through the K2pdfopt image-based conversion process, though, information technology's not a bad trade off. We can stand to increase the file size on a few PDFs in club to gain access to a portable and easily read re-create.
Update: Presently afterwards this article went live on the site Marcus wrote in and asked
What if you took the K2pdfopt.exe output and ran the resulting PDF through Calibre again to convert it to a MOBI or ePUB? Possibly that would stop Calibre from choking on the multi-column format since it would now exist formatted more like a standard book. Could yous guys try it out?
What if, Marcus? What if, indeed. We dove in deeper, Inception-mode, and performed a exam merely as you requested. Calibre handled the conversion beautifully and the text cleaned up perfectly. How perfectly? Hither'southward a snippet of the text seen in the screenshot above (which is properly formatted but a little grainy) afterward the reconversion process:
And in that location you have it. For a peculiarly tricky PDF file you tin can run information technology through K2pdfopt.exe, and so dump it dorsum into Calibre for a cleanup pass (cheque out how smooth the font is now in the to a higher place sample), and relish a totally optimized PDF. Good telephone call, Marcus! The actress step only adds a few minutes to the process and really tidies things up.
Take a conversion tip, pull a fast one on, or tool to share? We're interested to hear about it so shoot us an e-mail at tips@howtogeek.com or sound off about it in the comments here.
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Source: https://www.howtogeek.com/69481/how-to-convert-pdf-files-for-easy-ebook-reading/
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