https://bugs.kde.org/show_bug.cgi?id=503438

            Bug ID: 503438
           Summary: Transition PGM images (default ones) produce
                    artifacts.
    Classification: Applications
           Product: kdenlive
           Version: unspecified
          Platform: Other
                OS: Other
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Video Effects & Transitions
          Assignee: j...@kdenlive.org
          Reporter: gabcor...@gmail.com
  Target Milestone: ---

I've noticed that the PGM wipe images provided with Kdenlive have something bad
in them that produces artifacts that can be seen as a noise and an horizontal
pattern showed at the edges of the transitions. It happens to all of them at
several degrees of magnitude.

I've tried to quickly regenerate one of them (symmetric clock) as a test, using
Krita, to see if the problem was in the images themselves or it was something
in the code. 
Fortunately, the results with the new image was good, so there must be
something in the images themselves that is causing this problem.

Here I attach 3 images:
- result with current "Symmetric clock" wipe.
- result with new "Symmetric clock" wipe. 
- the new "Symmetric clock" image, itself. (it's only a draft to prove the
point, it doesn't accurately replicates the original one)

(I've tested it both with HD and SD versions of the images, and both produce
the same artifacts)

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