[Okular-devel] [Bug 250674] New: Okular prints text and vector graphics thicker than they should under some circumstances

[Alvaro Manuel Recio Perez]

https://bugs.kde.org/show_bug.cgi?id=250674

           Summary: Okular prints text and vector graphics thicker than
                    they should under some circumstances
           Product: okular
           Version: 0.11.1
          Platform: Ubuntu Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: PDF backend
        AssignedTo: okular-devel at kde.org
        ReportedBy: amrecio at gmail.com


Created an attachment (id=51478)
 --> (http://bugs.kde.org/attachment.cgi?id=51478)
Original cover as SVG for Inkscape

Version:           0.11.1 (using KDE 4.5.0) 
OS:                Linux

Please bear with me for a moment because this seem to be a bug which is
triggered only under certain circumstances. I discovered it while working with
some colleagues on a cover for a book made with Inkscape.

The cover of the book, which I'll attach to this bug, is saved as PDF from
Inkscape. When printed from Evince in Ubuntu 10.04 or Acrobat Reader in Windows
XP the result the same (and correct). When printed from Okular in Ubuntu 10.04
or Ubuntu 10.10 beta, the result is wrong: the lines of the illustrations are
thicker and the text is bolder than what it's shown on screen or the printing
from Evince or Acrobat Reader. This is especially noticeable on the star
pattern at the top and the bottom of the page: while the correct printing
produces a star with a sharp center, the center of the star printed from Okular
is just a blob of black ink where the individual lines can't be distinguished.

When I decided to report the bug I tried to create a sample PDF file to
reproduce the bug: a blank page with the star. However, that file is correctly
printed by Okular, producing a star with a sharp center. Then I began a trial
and error process to try to pinpoint the cause of the misbehaviour and it seems
that the Symbian logo is the culprit. Removing the Symbian logo from the cover
makes Okular produce the correct printing, identical to those of Evince and
Acrobat Reader, so that logo is somehow triggering the bug. It's also worth
noting that this bug only occurs with PDF files, as the full cover with the
Symbian logo is correctly printed when saved as a PostScript file.

I'm attaching the original cover for Inkscape, the PostScript version, the
cover without the Symbian logo as PDF and a minimal PDF file which triggers the
bug.

Reproducible: Always

Steps to Reproduce:
1. Open the PDF file with the Symbian logo.
2. Print it.

Actual Results:  
The printed page has thicker lines than usual and bolder text.

Expected Results:  
The printed page should look the same as on the screen.

OS: Linux (x86_64) release 2.6.32-24-generic
Compiler: cc
Distro: Kubuntu 10.04
KDE SC version: 4.5.1

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