Gradients not only displayed striped, they are really become striped and they 
looks like semi-transparent if there is something behind. For example if a 
shape has a shadow the shadow becomes visible behind the shape.
I have exported Draw and Impress documents to PDF and checked them in:
- Evince.
- PDFedit
- online GoogleDocs viewer
It looks the striped/semi-transparend every time but looks Ok in Adobe Reader.
// I use LibO 3.5.6.2 in Ubuntu 12.04

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https://bugs.launchpad.net/bugs/164233

Title:
  [Upstream] Exporting pdf from LibreOffice with smooth gradient
  displays striped in Evince, shows correctly in Adobe Reader

Status in Evince document viewer:
  Unknown
Status in libcairo  -  cairo vector graphics library:
  Confirmed
Status in “cairo” package in Ubuntu:
  Triaged

Bug description:
  1) lsb_release -rd
  Description:  Ubuntu 11.04
  Release:      11.04

  2) apt-cache policy evince
  evince:
    Installed: 2.32.0-0ubuntu12.2
    Candidate: 2.32.0-0ubuntu12.2
    Version table:
   *** 2.32.0-0ubuntu12.2 0
          500 http://us.archive.ubuntu.com/ubuntu/ natty-updates/main i386 
Packages
          100 /var/lib/dpkg/status
       2.32.0-0ubuntu12 0
          500 http://us.archive.ubuntu.com/ubuntu/ natty/main i386 Packages

  3) What is expected in Impress via the Terminal:

  cd ~/Desktop && wget
  
https://bugs.launchpad.net/ubuntu/+source/cairo/+bug/164233/+attachment/2281555/+files/example.odp
  && loimpress -nologo example.odp

  export the file with Gradient 1 inserted into the background to pdf (
  
https://bugs.launchpad.net/ubuntu/+source/cairo/+bug/164233/+attachment/2281556/+files/example.pdf
  ), open the pdf with Evince and it looks as it does in both Impress
  and Adobe Reader.

  4) What happens instead is Evince shows a striped gradient.

  WORKAROUND: Use Adobe Reader.

  apt-cache policy acroread
  acroread:
    Installed: 9.4.2-0natty1
    Candidate: 9.4.2-0natty1
    Version table:
   *** 9.4.2-0natty1 0
          500 http://archive.canonical.com/ubuntu/ natty/partner i386 Packages
          100 /var/lib/dpkg/status

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