https://bugs.documentfoundation.org/show_bug.cgi?id=149670

--- Comment #5 from Andras Timar <[email protected]> ---
I think the subject is a bit misleading. The referenced image is
ppt/media/image26.jpeg so it's not a PNG. Then a color change is applied, that
turns white-ish pixels transparent:
        <p:blipFill rotWithShape="1">
          <a:blip r:embed="rId3">
            <a:clrChange>
              <a:clrFrom>
                <a:srgbClr val="F4FFFF"/>
              </a:clrFrom>
              <a:clrTo>
                <a:srgbClr val="F4FFFF">
                  <a:alpha val="0"/>
                </a:srgbClr>
              </a:clrTo>
            </a:clrChange>
            <a:extLst>
              <a:ext uri="{28A0092B-C50C-407E-A947-70E740481C1C}">
                <a14:useLocalDpi
xmlns:a14="http://schemas.microsoft.com/office/drawing/2010/main"; val="0"/>
              </a:ext>
            </a:extLst>
          </a:blip>
          <a:srcRect l="13478" r="13229"/>
          <a:stretch/>
        </p:blipFill>
I think this color change is responsible for the artifacts that we see around
the geeko in LibreOffice. On the other hand, in PowerPoint the color change
replaces all pixels. Maybe PowerPoint uses a different threshold.

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