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Old 01-19-2024, 02:46 AM   #1
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Problem with fractional scaling
I'm running GNOME with fractional scaling (150%) on a HiDPI display. The Calibre UI looks very good here, except the ebook-viewer. It opens ebooks initially too small (not fitting the the window size) which can be fixed my resizing the window slightly. But besides that, the fonts (both, of the e-book and the viewer-ui) look coarse and washed-out.

With a scaling of 100% or 200%, everything looks ok.

Is there anything I can do about it? I wonder why it happens only in ebook-viewer.

(Running the official binary install (calibre 7.3) on Fedora Linux 39)
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Last edited by beedaddy; 01-19-2024 at 02:49 AM.
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Old 01-19-2024, 02:50 AM   #2
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because only the viewer uses qt webengine and no nothing you can do about it.
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Old 03-10-2024, 11:47 AM   #3
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I use KDE rather than GNOME, but I had a similar problem. Setting the environment varaible
Code:
QT_SCALE_FACTOR_ROUNDING_POLICY=RoundPreferFloor
solved the problem for me, and now fonts look good in both the editor and the viewer.
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Old 07-12-2024, 06:54 AM   #4
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Hello,

Thank you for this forum !
I'm using ebook-viewer (v.5.37 - 02-2022) on an ubuntu-linux laptop and I don't know how to change the font size. Is this possible?
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Old 07-12-2024, 07:00 AM   #5
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Quote:
Originally Posted by Myf View Post
Hello,

Thank you for this forum !
I'm using ebook-viewer (v.5.37 - 02-2022) on an ubuntu-linux laptop and I don't know how to change the font size. Is this possible?
Why not use the latest version of calibre?
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Old 07-12-2024, 07:01 AM   #6
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Quote:
Originally Posted by Myf View Post
Hello,

Thank you for this forum !
I'm using ebook-viewer (v.5.37 - 02-2022) on an ubuntu-linux laptop and I don't know how to change the font size. Is this possible?
hit Esc.
The settings menus are under the book. You can tick the setting to pin the toolbar while reading.

Why so old a Calibre? Is your laptop 32bit?
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Old 07-12-2024, 07:52 AM   #7
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It can be difficult to support an old version of calibre especially if any of the settings you'd need to adjust have changed in since then. So it's best to keep updated if you can.
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Old 07-12-2024, 10:38 AM   #8
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Thank you very much for your quick and valuable advice!

I'm using this old version of calibre because this laptop is my work laptop with a safe and old ubuntu LongTermSupport version.

So I will try to install a more recent version of calibre (on this old ubuntu).

Have a nice day!

F.
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Old 07-12-2024, 10:42 AM   #9
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And oups !

Thanks TheDucks, I've just discovered the magic "esc" key and how to resize the font.
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Old 07-12-2024, 06:27 PM   #10
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The Ctrl+F11 key sequence will hide/show the toolbar, by default it has the icons to change font size.

BR
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