Created attachment 145458 [details] PDF showing visual artefacts at certain zoom settings SUMMARY *** At certain zoom levels pdf images may display repeating rectangual markings whose size is related to the zoom level.. *** STEPS TO REPRODUCE 1. Open the attached pdf ("artefact"). This is actually an image, although text is displayed. 2. Set zoom level to 100%, then 110%. 3. Now, set zoom to 120%, then 125%. OBSERVED RESULT The view is as expected up to 110%. However, at 120%, you can definately make out repeating, bluish, rectangles in the background. These become very much smaller at 125%, and gradually fade away at incrementally larger zooms up to 150% or so. EXPECTED RESULT Obviously, there should be no such visual artefacts at any zoom. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Linux Mint (available in About System) KDE Plasma Version: KDE Frameworks Version: 5.89 Qt Version: 5.15.3 ADDITIONAL INFORMATION No artefacts were visible when viewing the same document at similar zooms in Xreader.
Please attach a screenshot of such artifact
Created attachment 145530 [details] Screenshot of Okular PDF artefacts at 120% zoom See attached. If you zoom the png image you will see the artefacts change in a similar way to how they zoom in the pdf. They are somewhat faint, but if viewing on a laptop they become clearer by changing the angle of the screen.
That image doesn't match with the PDF you attached.
Created attachment 145535 [details] Screenshot of part of original pdf showing artefacts at 120% zoom OK, here it is.
I can defenitely not see that kind of artifacts but i can reproduce some different ones, at much lower zoom levels though. Needs someone with time to investigate, most probably a poppler bug.