[Libreoffice-bugs] [Bug 143485] Slide image export: master slide image objects display inconsistent across export file formats

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=143485

--- Comment #3 from R. Bingham <rdbingham at verizon.net> ---
(In reply to Екатерина from comment #2)
> Hello. It is not clear what the error is. And it is not clear in steps how
> to get this error

Version: 7.1.5.2 (x64) / LibreOffice Community
Build ID: 85f04e9f809797b8199d13c421bd8a2b025d52b5
CPU threads: 8; OS: Windows 10.0 Build 19043; UI render: Skia/Vulkan; VCL: win
Locale: en-US (en_US); UI: en-US
Calc: CL

Steps to reproduce in more detail:

1) In LO, select File->New->Presentation. A new document with name "Untitled 1"
or such should be created.

2) Cancel "Select a Template" if that pop-up appears.

3) Select View->Slide Pane then View->Master Slide.  Likely only a single
master slide format will show consisting of a "Click to edit" top-of-slide
Title Area and a "Click to edit" body area containing a bullet outline
heirarchy.

4) Select Slide->New Master.  A second slide master template should appear in
the Slides side pane.  It should have name of "Default 1".

5) With the new master selected, Insert->Image then enter (using as readily
accessible PNG image)
https://ask.libreoffice.org/uploads/asklibo/original/1X/1eec1ce28d4605f25e751aea59dbef2bc0782151.png
in the file navigator widget image pathname area then Open. If the image file
download is successful than that PNG image should show in the center of the
"Default 1" master slide.

6) View->Normal then Slide->New Slide. Slide #2 should appear in the Slide Pane
and main edit window. Select the cursor in the slide title are an insert some
identifying title such as "Slide 2 title text" to demo its appearance in
exported slide.

7) Slide->Change Slide Master. In the "Select a Slide Design" popup, select the
master with the LO logo graphic showing then OK. The LO logo graphic should
show but be non-selectable as it is a master layer object, not a layer of an
individual slide.

8) File->Export then select in the File format droplist any of EMF, EPS, GIF,
PNG, SVG or WMF, then select a destination directory and File name of your
choice then select Export...

9) A popup may appear with options for the particular export file format
selected in (8). Take the defaults then OK.

10)
For export formats EMF, EPS, GIF, SVG or WMF view the export with your favorite
image file apps.  The result is an image file containing a slide with the
expected title text but no master slide background image. The master slide
background image silently disappears.

For export format PNG the result is Warning popup "Image filter not found."
then 
 Error popup "Error saving the document Untitled 1: General Error. General
input/output error.".

11) PNG PARTIAL WORKAROUND: The master slide image chosen here (
https://ask.libreoffice.org/uploads/asklibo/original/1X/1eec1ce28d4605f25e751aea59dbef2bc0782151.png
) contains transparency.  The bug list concerning LO dealing with transparency
in general is long and I'm not going to list it here. If during the export of a
slide containing a PNG image with transparency, the PNG option for Drawing
Object->Save transparency is UNCHECKED, then the export not only succeeds but
results in the expected exported slide image containing the LO logo master
slide image.

Regards.

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