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Old 04-16-2018, 04:43 AM   #1
GrannyGrump
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Converting JP2 to PDF?

I have a set of 745 image scans in JP2 format (jpeg 2000) of a very large book. Obtained from archive.org. Unfortunately the PDF from that site is not downloadable due to enormous size of 1.8 GB --- it keeps timing out. (reported to site admin, and they say not working due to file size, so probably not going to get fixed)

I would like to convert the images to PDF, to use for proof-reading, so it does not have to be very high quality, but must be readable. It can be in sections, does not have to be one huge pdf file.

Does anyone have a recommendation for an online converter with no size limit, or a FREE easy-to-use standalone application available for download?
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Old 04-16-2018, 12:56 PM   #2
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If you're familiar with running command line tools you could convert the .jp2 files with ImageMagick (freeware).
  1. Install ImageMagick.
  2. Open a command prompt window.
  3. Use the cd command to change to the folder that contains the .jp2 files. E.g.
    Code:
    cd c:\images
  4. Enter the following command:
    Code:
    convert *.jp2 book.pdf
However, since the conversion is very slow (about 1-2 minutes for 10 .jp2 files) and produces rather large .pdf files (about 40MB for 10 .jp2 files), you might want to convert the book in batches.
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Old 04-16-2018, 01:20 PM   #3
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There are usually a fully functional 15-30 days free-trials for Adobe Acrobat, Abbyy Finereader, PDFelement 6 Pro, Foxit Editor etc. usually just with an applied watermark which could be stripped off later on, or as is still the case with Abbyy enforcing 100 pages total restriction that could e.g. be circumvented by using several computers or OS, reinstalled OS, virtual machines etc.

There are also free OCR solutions like Topocr, Freeocr ...

https://www.makeuseof.com/tag/top-5-...-into-text-nb/

https://windowsreport.com/ocr-software-windows-10/


Some Pdf conversion tips on Willus' k2pdfopt pages.

http://www.willus.com/k2pdfopt/pdf_conversion.shtml

Last edited by Marinolino; 04-16-2018 at 06:51 PM.
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Old 04-16-2018, 06:07 PM   #4
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Yep, I agree with Doitsu, ImageMagick is probably your best bet.

Could you attach some of these JP2s (maybe 10 pages) into a ZIP so we could fiddle around? (Or just link to the Archive.org page?)

Another potential workflow is to use ImageMagick to convert from JPG2000 -> TIFF, then import those into ScanTailor (which can do a lot of the Normalization/Cropping + B/W conversions).
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Old 04-16-2018, 06:39 PM   #5
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IrfanView (Freeware) can batch convert jp2 to any image format you like quite fast. You can then use the free jpg to pdf converter to turn the images into a pdf. (The converter is misnamed: you can use png files just as well). I've done it that way quite a few times, and it works nice and quickly.

https://www.irfanview.com/

http://www.freepdfsolutions.com/free...converter.html

EDIT: For reference: after I posted this, I started a conversion the way I described. 230 pages, the pdf file was ready three minutes ago, so those 230 pages took under twenty minutes. So your 745 pages should be done in about an hour.

Last edited by doubleshuffle; 04-16-2018 at 07:02 PM.
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Old 04-17-2018, 05:51 AM   #6
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Whee! This is a nice handful of options. Thank you so much, guys!

I will be trying the FreePdfSolutions and ImageMagick. For this project, I don't need OCR or very high quality, it will only be needed as a basis for proof-reading, so whatever works fast will do this time.

Thanks again to all, it is always a good thing to have multiple tools in the chest.

gG
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Old 04-17-2018, 07:24 PM   #7
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Quote:
Originally Posted by GrannyGrump View Post
Whee! This is a nice handful of options. Thank you so much, guys!
Always willing to help you, GrannyGrump.

Well let us know how it goes or if you get stuck. I know some of that ImageMagick documentation/posts can be a beast.

Side Note: I also know that GIMP is finally introducing batch processing in GIMP v2.10 (coming soon, they released RC2 today).

PS. PM me all the deats... I miss you! :P
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Old 04-20-2018, 12:27 PM   #8
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wget is a cross platform web download utility that can continue interrupted downloads.

Also, the ImageMagick utility display will display JPEG2000 images, so conversion might not be needed.
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Old 06-04-2018, 05:41 AM   #9
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I am personally using ImageMagick for such a purpose and it works best for me so I never tried others
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Old 06-27-2018, 12:03 PM   #10
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I've commented on this elsewhere but XnView and XnConvert are cross platform programs (Windows, Linux and Mac) that can convert to and from a large number of formats. There is also a command line converter, NConvert.

I use both XnView and XnConvert to prepare images for OCR. Usually cropping headers and page numbers after running the images through ScanTailor. It has always (almost always) worked well for me.
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