https://bugs.kde.org/show_bug.cgi?id=410737

            Bug ID: 410737
           Summary: Hashed display of pdf images created with gnuplot
           Product: okular
           Version: unspecified
          Platform: Slackware Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-de...@kde.org
          Reporter: ao...@mail.ru
  Target Milestone: ---

Created attachment 122019
  --> https://bugs.kde.org/attachment.cgi?id=122019&action=edit
pdf file which demonstrates the problem

SUMMARY
Slackware Linux, current, kde 4.14.38
When using okular to display pdf files created with gnuplot (pm3d map) 
hash appears over the plot areas (and colorbox).

No hash (almost) when using xpdf, older version of okular (slackware 14.2, kde
4.14.32)

pdftopng removes hashes...



STEPS TO REPRODUCE
1. create pdf using gnuplot, cairolatex, pm3d map 
z.plt:

set terminal cairolatex pdf standalone  size 12cm,12cm
set output "z.tex"

A(x,y) = x**2+y**2 < 1 ? exp(-x**2-y**2) : NaN

set xrange [-2:2]
set yrange [-2:2]

set isosamples 300 
set pm3d map
splot A(x,y)

--

$ gnuplot z.plt
$ pdflatex z
$ okular z.pdf


OBSERVED RESULT
hash lines over the image and colorbox

EXPECTED RESULT
smooth color image

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Slackware current (14.2+), kde  4.14.38
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 4.8.7

ADDITIONAL INFORMATION

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