https://bugs.freedesktop.org/show_bug.cgi?id=75346
Priority: medium
Bug ID: 75346
Assignee: [email protected]
Summary: [SLIDESHOW] Images scaled down poorly, resulting in
aliasing/moire patterns
Severity: normal
Classification: Unclassified
OS: Linux (All)
Reporter: [email protected]
Hardware: x86-64 (AMD64)
Status: UNCONFIRMED
Version: 4.1.3.2 release
Component: Presentation
Product: LibreOffice
I have a presentation with a very large image. In editing view, it gets scaled
down nicely, and there's very little in the way of aliasing or moire pattern
visible. When I run the presentation, the image is scaled poorly, and severe
moire patterning is visible. The same thing happens if I remove the background
and instead insert the image as a normal image object in the slide itself.
I have both hardware acceleration and antialiasing enabled in Options > View >
Graphics output.
The best workaround is to:
- scale the image to the right size and resolution yourself outside Impress,
or
- insert the image as an image object within the slide, and then right-click
on it, and select "Compress graphic" to scale it down to size
Either of these will permanently change the image in your presentation, so you
might end up changing the image for each different output device.
Instead, Impress should scale the image down better.
I'll attach screenshots showing the effect shortly.
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