Problem with fractional scaling

beedaddy · 01-19-2024, 02:46 AM

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)

kovidgoyal · 01-19-2024, 02:50 AM

because only the viewer uses qt webengine and no nothing you can do about it.

DrLimu · 03-10-2024, 11:47 AM

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.

01-19-2024, 02:46 AM	#1
beedaddy Zealot Posts: 146 Karma: 131606 Join Date: Oct 2011 Location: Germany (south-west) Device: Kobo Clara 2E, Tolino shine 4	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) Attached Thumbnails Last edited by beedaddy; 01-19-2024 at 02:49 AM.

03-10-2024, 11:47 AM	#3
DrLimu Connoisseur Posts: 54 Karma: 2485318 Join Date: Jun 2018 Location: Sweden Device: Kobo Clara	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.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Fractional Page Numbering	j.p.s	General Discussions	83	11-17-2019 12:31 PM
UI Scaling 4K	khashyarkh	Calibre	2	10-21-2016 06:29 AM
Fractional Stars needed...	RsH	Library Management	0	09-13-2011 07:50 PM
problem scaling images	paola	ePub	11	05-12-2011 02:20 AM
scaling pdfs	davec67	Sony Reader	4	10-01-2006 08:07 AM

01-19-2024, 02:50 AM	#2
kovidgoyal creator of calibre Posts: 43,860 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	because only the viewer uses qt webengine and no nothing you can do about it.

Advert