[Poppler-bugs] [Bug 62418] New: Bilinear scaling results in blurry Aztec code printing

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=62418

          Priority: medium
            Bug ID: 62418
          Assignee: poppler-bugs at lists.freedesktop.org
           Summary: Bilinear scaling results in blurry Aztec code printing
          Severity: major
    Classification: Unclassified
                OS: All
          Reporter: mgorny at gentoo.org
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: splash backend
           Product: poppler

For some time, I am using printed train tickets which contain a small bit of
some industrial 2D barcode. Sadly, after late poppler update the printed codes
got blurry and thus become unreadable.

I am using evince to print the tickets. It uses poppler-glib to handle PDF
files and CUPS as a printer backend. CUPS passes jobs to lprng which uses
foomatic-filters to print it :).

Sadly, I am able to reproduce it only through printing. The evince view of the
ticket is blurry until I zoom it in. The print preview is always blurry
independently of zoom and poppler version. The actual print is blurry is
poppler-0.21.3+, and sharp in earlier versions.

I was able to bisect the issue to the following commit:

commit a97aead193a927b91a4e33d7b5d2ba7179e664df
Author: Adrian Johnson <ajohnson at redneon.com>
Date:   Fri Nov 30 21:30:19 2012 +0100

    Splash: Implement bilinear image scaling

    Bug #22138

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