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Poster: KedriD Date: Sep 28, 2020 11:55pm
Forum: opensource Subject: Re: Test Posts

Cool, thanks for the clarification.
I think there could be a problem for the .pdf though :-

I believe there is a file limit of about 10GB for .pdfs due to internal 10-bit cross-reference tables(correct me if i'm wrong) - at least for 32-bit .pdf viewers.

A 130 page mage at 600 dpi = 10.4GB of .png files and about 9.3GB for lossless .jp2

So there must be some compromises on compression i.e. lossy.
Is there any guidance on .jp2 compression ratio to use that reduces file size but doesn't impact on OCR effectiveness ?

Can I create the .pdf and upload to override/stop the auto generated one ? it would be a shame as the .pdf with text seems like the most usefull one.

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Poster: Jeff Kaplan Date: Sep 29, 2020 7:53am
Forum: opensource Subject: Re: Test Posts

i'd suggest uploading a test pdf.

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Poster: KedriD Date: Oct 4, 2020 11:52pm
Forum: opensource Subject: Re: Test Posts

Thanks for assistance I was getting confused by
https://help.archive.org/hc/en-us/articles/360001820212-How-to-upload-scanned-images-to-make-a-book
I thought I had to upload zipped .jp2
For ref and searches for other people it was much easier to upload a created .pdf
Seems to work(Can take some time which is absolutely fine) if i keep the .pdf under 1GB so will do so from now on.