Not a bug

Image quality much worse than original in PDFs

9 years ago • updated by 9 years ago • 6

I noticed that the image quality when displaying PDFs in the browser is much worse than the original PDF displayed in a reader. This makes for example small text very difficult to read, images are blurry etc. Why is that?
I didn't find any relevant options to set the quality, perhaps that could be something to improve upon?

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Under review

9 years ago

That's an intentional limitation of the free version of the JPedal library Ubooquity uses to render PDF books (comics are rendered by a different one which just extract images without rendering anything else). Despite a very long search, I was not able to find a free Java library that was capable of correctly rendering all PDF files, so I settled for this one.

I have plans to try to use Mozilla's PDF.js library to do PDF books rendering. It's quite good and would greatly improve quality. But I don't know yet when I'll integrate it (and if it will work).

9 years ago

How much is the "not free" library? Maybe it could be a donation drive to raise the $$ to purchase it for incorporation. Just a thought as the majority of our household uses Ubooquity for PDFs (or epubs). Thanks!

9 years ago

From what I have seen, usually a few thousand dollars or euros.
That's not realistic (nor reasonable for a small project like Ubooquity).

Epub reader is on the way (though the way is quite long), and PDF.js integration is next.

Not a bug

9 years ago

Thank you for the quick update. Unfortunately I don't have much experience on Java myself, or I would probably be able to help there (I'm a C# developer, it's close enough but not quite the same).

I will keep my eyes open in case I find anything that can help in this matter though.

9 years ago

Thank you!

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