Bug 42836 - Impress: Drawing with gradient and transparency changes on full-screen presentation
Summary: Impress: Drawing with gradient and transparency changes on full-screen presen...
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Impress (show other bugs)
(earliest affected)
3.3.4 release
Hardware: All All
: medium normal
Assignee: Not Assigned
Depends on:
Blocks: Impress-Gradient
  Show dependency treegraph
Reported: 2011-11-11 14:58 UTC by Mark van Rossum
Modified: 2015-09-20 17:26 UTC (History)
2 users (show)

See Also:
Crash report or crash signature:

Presentation with drawing (18.16 KB, application/vnd.oasis.opendocument.presentation)
2011-11-11 14:58 UTC, Mark van Rossum
pdf export (209.90 KB, application/x-pdf)
2011-11-11 14:59 UTC, Mark van Rossum
presentation screenshot (png) (22.83 KB, image/png)
2015-09-20 17:09 UTC, Carlo Strata
new pdf export (lo (257.42 KB, application/pdf)
2015-09-20 17:11 UTC, Carlo Strata

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Description Mark van Rossum 2011-11-11 14:58:34 UTC
Created attachment 53425 [details]
Presentation with drawing


The attached example has a gradient.
It looks fine when editing it, but in presentation mode or  exported to PDF it changes appearance.
Comment 1 Mark van Rossum 2011-11-11 14:59:26 UTC
Created attachment 53426 [details]
pdf export
Comment 2 sasha.libreoffice 2012-03-22 09:08:00 UTC
Thanks for bugreport
Reproduced in 3.3.4 and 3.5.1 on Fedora 64 bit and Windows XP 32 bit
Presentation has object, filled by gradient, to which applied transparency. And when press F5, we see that transparency is too high, gradient almost unseen.
Changing version to 3.3.4 as most early reproducible 

PS: radial gradients exports to PDF as many circles. When we see PDF on screen, for example in Okular, circles interfere between them self and we see so strange result. It depends from zoom.
Try not use radial gradient for export to PDF or convert them to raster image and place into presentation as raster image instead of original, then export to PDF.
Comment 3 A (Andy) 2013-04-23 20:27:34 UTC
not reproducible with LO (Win7 Home, 64bit)

I would say this issue was resolved in the meantime. 
@Mark and Sasha: Can you confirm this?  If yes, than I would propose to close this issue.
Comment 4 sasha.libreoffice 2013-04-24 10:56:41 UTC
reproduced in 4.0.2 on Fedora (RFR) 64 bit
To reproduce, should be disabled this:
Tools->Options->LibreOffce->View-> option "Use Anti-Aliasing"
Comment 5 A (Andy) 2013-04-24 21:21:29 UTC
@Sasha: Thank you very much for your hint.

If I disable "Use Anti-Aliasing", then this bug is reproducible with LO (Win7 Home, 64bit).
Comment 6 Mark van Rossum 2014-08-26 11:31:27 UTC
Works for me with on FC20 , irrespective of the anti-alias  setting.

The PDF shows a bit of Moire patterning, but otherwise fine.

For me it appears solved.
Comment 7 QA Administrators 2015-09-04 02:49:49 UTC
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Comment 8 Carlo Strata 2015-09-20 17:07:56 UTC
I have tested the bug2.odp file on this system:
- Microsoft Windows 10, x64, ita, home, daily updated;
- LibreOffice, win64 build.

The presentation screen and also the pdf export are both ok (that means the shade are up starting, like in editing mode, and not centre starting like in the originally attached pdf export).

I will attach both the new:
- presentation screenshot (png);
- new pdf export.

Have a nice evening,


p.s. On the contrary my similar bug 81360 still remains unsolved in the same system... ;-)
Comment 9 Carlo Strata 2015-09-20 17:09:54 UTC
Created attachment 118877 [details]
presentation screenshot (png)
Comment 10 Carlo Strata 2015-09-20 17:11:49 UTC
Created attachment 118878 [details]
new pdf export (lo
Comment 11 Carlo Strata 2015-09-20 17:26:11 UTC
The bug is fixed regardless to the
Tools -> Options -> LibreOffce -> View -> option "Use Anti-Aliasing"
status (enabled/disabled).