[Libreoffice-bugs] [Bug 143001] New: Transparency in imported SVG is not handled correctly

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=143001

            Bug ID: 143001
           Summary: Transparency in imported SVG is not handled correctly
           Product: LibreOffice
           Version: 7.0.5.2 release
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: filters and storage
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: michael at vonglasow.com

Created attachment 173100
  --> https://bugs.documentfoundation.org/attachment.cgi?id=173100&action=edit
SVG as exported from Impress (text redacted with Inkscape and saved as plain
SVG)

To reproduce:

* In Impress, draw a few shapes with a colored background, and assign them
different levels of transparency.
* Select the shapes on the slide and export them to SVG.
* Open the resulting SVG in Draw, or import it into Writer (any other LO app
should yield the same result but was not tried), and examine the
semitransparent shapes.


Expected result:

All drawing objects look just like they did in the original Impress
presentation.


Actual result:

Transparency values differ from the original when opened or imported in LO.


Additional information:

Transparency is as expected when opening the exported SVG with Inkscape.
Apparently the error happens on import.

I did not investigate further how different transparencies are affected (e.g.
inverted, offset by a certain value, scaled etc.), or if documents generated in
an external SVG application behave the same. Opening the exported SVG in
Inkscape and saving it (as plain SVG) does not seem to have an effect, though
(rendering issues are the same as with the original exported SVG).

The bug was observed with 7.0.5.2 on Windows 10; I did not try any other
versions.

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