[okular] [Bug 391625] Okular displays blurry images when opening epub files

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=391625

lfsj_egrf...@nefyp.com changed:

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--- Comment #12 from lfsj_egrf...@nefyp.com ---
yes I believe this is a good solution for now. we should add the ability to,
for example double click on an image in an epub, to view it in its full
original resolution. in a popup for example.

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[okular] [Bug 391625] Okular displays blurry images when opening epub files

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=391625

yoshitaka.shinag...@protonmail.com changed:

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[okular] [Bug 391625] Okular displays blurry images when opening epub files

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=391625

almbor...@hotmail.com changed:

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Version|1.4.3   |22.04.3
 CC||almbor...@hotmail.com

--- Comment #11 from almbor...@hotmail.com ---
I think it is the same bug.
My images gets zoomed in so much that they are not shown whole and are very
pixelated.
This really hampers Okular to be used as an epub reader.
E.g. If I have a table that I can only read half of.
Here is an image of the problem https://imgur.com/a/eTxXqyE

Until the bug is fixed is there a workaround to see the whole image?

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[okular] [Bug 391625] Okular displays blurry images when opening epub files

[Mads]

https://bugs.kde.org/show_bug.cgi?id=391625

--- Comment #10 from Mads  ---
This doesn't have an easy fix, unfortunately, because more often than not a
page is css data, not a raw png, even if it's a comic. So I haven't found a
simple method for scaling the page when it needs to expand to fill the frame in
okular - I guess it needs some kind of viewport/zoom functionality on a page
itself. You can't do it in image scaling alone, at least I couldn't get it to
work.

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[okular] [Bug 391625] Okular displays blurry images when opening epub files

[Mads]

https://bugs.kde.org/show_bug.cgi?id=391625

--- Comment #9 from Mads  ---
When I checked now with an epub of a comic I just got from Kobo, and there the
png was 1400x2000. So I don't think we should just double it, we should triple
the size to 1800, 2400 to be sure. Or make it configurable, of course.

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[okular] [Bug 391625] Okular displays blurry images when opening epub files

[Mads]

https://bugs.kde.org/show_bug.cgi?id=391625

Mads  changed:

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 CC||m...@ab3.no

--- Comment #8 from Mads  ---
This is still an issue with Okular 22.04. Seems like an easy solution would be
to just double the setPageSize to 1200, 1600. Seems to work fine here, tested
on a HiDPI screen.

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[okular] [Bug 391625] Okular displays blurry images when opening epub files

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=391625

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[okular] [Bug 391625] Okular displays blurry images when opening epub files

[David Palacio]

https://bugs.kde.org/show_bug.cgi?id=391625

David Palacio  changed:

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[okular] [Bug 391625] Okular displays blurry images when opening epub files

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=391625

lordj...@gmail.com changed:

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--- Comment #7 from lordj...@gmail.com ---
Same on Kubuntu 18.10

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[okular] [Bug 391625] Okular displays blurry images when opening epub files

[Francesco Turco]

https://bugs.kde.org/show_bug.cgi?id=391625

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[okular] [Bug 391625] Okular displays blurry images when opening epub files

[Heinz Wiesinger]

https://bugs.kde.org/show_bug.cgi?id=391625

--- Comment #6 from Heinz Wiesinger  ---
I looked into this today and I think I found the root cause of the issue. I
don't know how to fix it though :/

The problem seems to be

setPageSize(QSizeF(600, 800));

This has the effect that images loaded later will be scaled to fit that size.
If they are smaller, they will be scaled up, if they are larger they will be
scaled down. When you view a document at 100%, you're thus not viewing the
image in its original size, but 100% of its scaled version.

I verified this by setting the page size to what is defined in the epub itself
and disabling the scaling altogether. Images were showing fine then.

The problem is that there is no standard for defining the page size for an
epub.
In fact, the epub mentioned earlier doesn't even mention a page size.

I have a Manga epub which defines the page size like this:



(which at least seems to be some standard among art books)

and the title page of a novel which looks like this:

http://www.w3.org/2000/svg;
xmlns:xlink="http://www.w3.org/1999/xlink; version="1.1" width="100%"
height="100%" viewBox="0 0 592 871">



On top of this, different pages in the same document can have different sizes.

Not really sure how to go about this :/

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[okular] [Bug 391625] Okular displays blurry images when opening epub files

[Heinz Wiesinger]

https://bugs.kde.org/show_bug.cgi?id=391625

Heinz Wiesinger  changed:

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[okular] [Bug 391625] Okular displays blurry images when opening epub files

[Nate Graham]

https://bugs.kde.org/show_bug.cgi?id=391625

--- Comment #5 from Nate Graham  ---
Yes, the path patch improved things, but it's not 100% solved yet.

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[okular] [Bug 391625] Okular displays blurry images when opening epub files

[Christoph Feck]

https://bugs.kde.org/show_bug.cgi?id=391625

--- Comment #4 from Christoph Feck  ---
Any work left for this ticket?

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[okular] [Bug 391625] Okular displays blurry images when opening epub files

[Albert Astals Cid]

https://bugs.kde.org/show_bug.cgi?id=391625

--- Comment #3 from Albert Astals Cid  ---
Git commit 57be655c15e2a9349e0f1dd5c9d083675c85a7f4 by Albert Astals Cid, on
behalf of Gilbert Assaf.
Committed on 28/07/2018 at 21:13.
Pushed by aacid into branch 'Applications/18.08'.

Improve picture scaling issues in epub generator

Test Plan: I tested the file mentioned in the bug report. Pictures look less
blurry

Reviewers: #okular

Subscribers: ngraham, aacid, okular-devel

Tags: #okular

Differential Revision: https://phabricator.kde.org/D13766

M  +2-2generators/epub/epubdocument.cpp

https://commits.kde.org/okular/57be655c15e2a9349e0f1dd5c9d083675c85a7f4

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[okular] [Bug 391625] Okular displays blurry images when opening epub files

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=391625

jrheoffic...@gmail.com changed:

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 CC||jrheoffic...@gmail.com
Version|1.3.2   |1.4.3

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[okular] [Bug 391625] Okular displays blurry images when opening epub files

[Simon Andric]

https://bugs.kde.org/show_bug.cgi?id=391625

Simon Andric  changed:

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[okular] [Bug 391625] Okular displays blurry images when opening epub files

[Nate Graham]

https://bugs.kde.org/show_bug.cgi?id=391625

Nate Graham  changed:

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 Ever confirmed|0   |1
 Status|UNCONFIRMED |CONFIRMED

--- Comment #2 from Nate Graham  ---
The file that reproduces the issue is available at
https://nofile.io/f/wx5M48ugyO9/10.1007_978-1-4302-6653-2.epub. I can't attach
it here because it's slightly too large for the 4MB file size limit.

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[okular] [Bug 391625] Okular displays blurry images when opening epub files

[Nate Graham]

https://bugs.kde.org/show_bug.cgi?id=391625

Nate Graham  changed:

   What|Removed |Added

  Component|general |EPub backend
 CC||n...@kde.org

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[okular] [Bug 391625] Okular displays blurry images when opening epub files

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=391625

--- Comment #1 from huma...@posteo.de ---
Created attachment 111287
  --> https://bugs.kde.org/attachment.cgi?id=111287=edit
Same image opened im Mcomix

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