https://bugs.kde.org/show_bug.cgi?id=489295
Bug ID: 489295
Summary: Okular 24.05.1 - Comic book - Arch Linux - Some
distorted AVIF pages in zip compressed (cbz) comic
books.
Classification: Applications
Product: okular
Version: 24.05.1
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Comicbook backend
Assignee: okular-devel@kde.org
Reporter: reportbug.fretful...@passinbox.com
Target Milestone: ---
Created attachment 171075
--> https://bugs.kde.org/attachment.cgi?id=171075&action=edit
Original images and script for building a buggy comic book
System information: Arch linux + plasma-meta + okular + kimageformats + libavif
+ libheif (all completely updated)
Material.7z content for reproducing the bug :
---------------------------------------------
- Images downloaded from:
https://wiki.creativecommons.org/wiki/Spectrumofrights_Comic1
- convertir_AVIF.sh script: Takes a 'directory' as unique argument ¡¡¡¡ without
the ending slash '/' !!!!! (if the ending slash is included the ending comic
book creates inside this directory and the last command removes this directory
with the comic) and produces a directory.cbz comic book
- In this case the pages were vertically oriented (-rotate 90 imagemagick
argument) for being able to reproduce the bug.
SUMMARY:
--------
If an AVIF formated images containing zip compressed comic book (cbz) is
opened, some pages are vertically stretched and horizontally shrink, so they
are completely deformed. Using 7z (-tzip argument) or zip make different pages
to be deformed (what is deformed with a compression tool may not be deformed
with the other tool):
"zip -r comic.cbz directory" has deformed images as "7z -tzip comic.cbz
directory" has, but they may be in different locations.
If the comic book is uncompressed (7z x comic.cbz) gwenview show images
correctly. If tar (-ttar 7z parameter) or 7z default algorithm are used there
is no problem. Extracting the deformed pages and opening them individually
(okular extracted_image.avif) shows them correctly. The bug only occurs if an
AVIF images containing directory is compresed in zip format for creating a cbz
comic book.
Resuming:
- Extract Material.7z content.
- The argument directory of convertir_AVIF.sh will be removed so create a copy
of Imágenes directory. For this example: cp -r Imágenes Cómic
- Execute "sh convertir_AVIF.sh Cómic"
- Open the resulting Cómic.cbz file with okular
- There will be some disorted images. (If not forget this bug report and I'll
have to dig in my system to find the source of the error XD)
- Modifications to the script:
7z -tzip a "$1".cbz "$1" &&\ -> zip -r "$1".cbz "$1" &&\ [Will have deformed
images too, possibly in different locations]
7z -tzip a "$1".cbz "$1" &&\ -> 7z -ttar a "$1".cbt "$1" &&\ [The generated
comic book will not have any problem]
7z -tzip a "$1".cbz "$1" &&\ -> 7z a "$1".cb7 "$1" &&\ [The generated comic
book will not have any problem]
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch + Plasma 6.1.0
(available in About System)
KDE Plasma Version: 6.1.0
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.2
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