Created attachment 97915 [details] Problematic PDF Okular (the KDE document viewer) does not correctly rasterise the attached PDF at certain (resolution-dependant) zoom levels. The problem is probably an anti-aliasing issue when two rectangles with slightly different width are drawn on top of each other to produce an equal sign. It seems to be a poppler issue as Evince shows a similar bug, though not as drastic as Okular. I checked a few other viewers, in particular Adobe Acrobat, and none of them showed the issue. The LaTeX code to produce the PDF can be found here [1]. My Okular bug report can be found here [2]. There you may also find a few screenshots which illustrate the problem. I can confirm the bug on my KUbuntu 14.04 netbook with poppler version 0.24.5. However, the bug isn't new, it is at least 2 years old. [1] http://tex.stackexchange.com/questions/168071/tikz-double-line-rasterisation-issue [2] https://bugs.kde.org/show_bug.cgi?id=332900 Steps to Reproduce: Load the PDF and try different zoom levels. (The 'bad' zoom levels seem to dependent on the screen resolution.) On my netbook (1024x600), the issue appears below 200%.
-- GitLab Migration Automatic Message -- This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity. You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/poppler/poppler/issues/477.
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.