MobileRead Forums
Register Guidelines E-Books Today's Posts Search

Go Back   MobileRead Forums > E-Book Software > Calibre
Reload this Page Calibre doesn't seem to support 125% scaling

Notices

Reply
 
Thread Tools Search this Thread
Old 03-08-2021, 08:26 AM   #1
davidhcje
Connoisseur
davidhcje began at the beginning.
 
Posts: 79
Karma: 10
Join Date: Mar 2021
Device: android phone
Calibre doesn't seem to support 125% scaling
Background & Settings
I'm using windows 10 and I have two monitors with different resolutions and scaling:
  • A: 1440p with 150% scaling factor
  • B: 1080P with 125% scaling factor
I keep this setting to default: preferences > look & feel > main interface > adjust for high resolution screen: automatic.

Problem
All Calibre windows (main window, viewer, editor, preferences, etc.) show different scales on two monitors, larger on the 150% scaling screen, and smaller on the 125% scaling screen.

Possible reason
I made some experiments and found that Calibre doesn't support 125% scaling factor, as it treats a 125% screen same as 100%.

Suggestion
I'm propose a new feature, making Calibre support 125% scaling factor, in a future release.
davidhcje is offline   Reply With Quote
Old 03-08-2021, 09:15 AM   #2
kovidgoyal
creator of calibre
kovidgoyal ought to be getting tired of karma fortunes by now.kovidgoyal ought to be getting tired of karma fortunes by now.kovidgoyal ought to be getting tired of karma fortunes by now.kovidgoyal ought to be getting tired of karma fortunes by now.kovidgoyal ought to be getting tired of karma fortunes by now.kovidgoyal ought to be getting tired of karma fortunes by now.kovidgoyal ought to be getting tired of karma fortunes by now.kovidgoyal ought to be getting tired of karma fortunes by now.kovidgoyal ought to be getting tired of karma fortunes by now.kovidgoyal ought to be getting tired of karma fortunes by now.kovidgoyal ought to be getting tired of karma fortunes by now.
 
kovidgoyal's Avatar
 
Posts: 44,565
Karma: 24495948
Join Date: Oct 2006
Location: Mumbai, India
Device: Various
calibre doesnt do scaling, Qt the graphics toolkit calibre uses does. You will need to add support for it there, not in calibre.
kovidgoyal is offline   Reply With Quote
Advert
Old 03-10-2021, 05:15 AM   #3
davidhcje
Connoisseur
davidhcje began at the beginning.
 
Posts: 79
Karma: 10
Join Date: Mar 2021
Device: android phone
Got it. Thank you!
davidhcje is offline   Reply With Quote
Old 05-11-2024, 04:12 AM   #4
mblrdr
Enthusiast
mblrdr began at the beginning.
 
Posts: 32
Karma: 10
Join Date: Feb 2022
Device: none
Switching between Paged mode and Flow mode is not possible via either Settings nor via shortcut (ctrl+m) when Windows scaling is 150%. On 125% scaling everything is fine.

Monitor 2560x1440, Calibre 7.8, Win10

Guess that's not a QT bug but a bug in calibre itself then.
mblrdr is offline   Reply With Quote
Old 05-11-2024, 04:15 AM   #5
kovidgoyal
creator of calibre
kovidgoyal ought to be getting tired of karma fortunes by now.kovidgoyal ought to be getting tired of karma fortunes by now.kovidgoyal ought to be getting tired of karma fortunes by now.kovidgoyal ought to be getting tired of karma fortunes by now.kovidgoyal ought to be getting tired of karma fortunes by now.kovidgoyal ought to be getting tired of karma fortunes by now.kovidgoyal ought to be getting tired of karma fortunes by now.kovidgoyal ought to be getting tired of karma fortunes by now.kovidgoyal ought to be getting tired of karma fortunes by now.kovidgoyal ought to be getting tired of karma fortunes by now.kovidgoyal ought to be getting tired of karma fortunes by now.
 
kovidgoyal's Avatar
 
Posts: 44,565
Karma: 24495948
Join Date: Oct 2006
Location: Mumbai, India
Device: Various
Works fine for me at 125% and 150%
kovidgoyal is offline   Reply With Quote
Advert
Old 05-11-2024, 06:41 AM   #6
JSWolf
Resident Curmudgeon
JSWolf ought to be getting tired of karma fortunes by now.JSWolf ought to be getting tired of karma fortunes by now.JSWolf ought to be getting tired of karma fortunes by now.JSWolf ought to be getting tired of karma fortunes by now.JSWolf ought to be getting tired of karma fortunes by now.JSWolf ought to be getting tired of karma fortunes by now.JSWolf ought to be getting tired of karma fortunes by now.JSWolf ought to be getting tired of karma fortunes by now.JSWolf ought to be getting tired of karma fortunes by now.JSWolf ought to be getting tired of karma fortunes by now.JSWolf ought to be getting tired of karma fortunes by now.
 
JSWolf's Avatar
 
Posts: 76,494
Karma: 136564766
Join Date: Nov 2006
Location: Roslindale, Massachusetts
Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3
Quote:
Originally Posted by mblrdr View Post
Switching between Paged mode and Flow mode is not possible via either Settings nor via shortcut (ctrl+m) when Windows scaling is 150%. On 125% scaling everything is fine.

Monitor 2560x1440, Calibre 7.8, Win10

Guess that's not a QT bug but a bug in calibre itself then.
My laptop screen is 2560x1440 and I have Windows 11 at 125% scale. All versions of calibre 7 work without a problem.
JSWolf is offline   Reply With Quote
Old 05-11-2024, 09:28 AM   #7
Quoth
the rook, bossing Never.
Quoth ought to be getting tired of karma fortunes by now.Quoth ought to be getting tired of karma fortunes by now.Quoth ought to be getting tired of karma fortunes by now.Quoth ought to be getting tired of karma fortunes by now.Quoth ought to be getting tired of karma fortunes by now.Quoth ought to be getting tired of karma fortunes by now.Quoth ought to be getting tired of karma fortunes by now.Quoth ought to be getting tired of karma fortunes by now.Quoth ought to be getting tired of karma fortunes by now.Quoth ought to be getting tired of karma fortunes by now.Quoth ought to be getting tired of karma fortunes by now.
 
Quoth's Avatar
 
Posts: 12,379
Karma: 92073397
Join Date: Jun 2017
Location: Ireland
Device: All 4 Kinds: epub eink, Kindle, android eink, NxtPaper11
Also with external 2560x1440 16″ USB-C/HDMI screen on Linux Mint on Laptop or Raspberry Pi4b Ubuntu the Calibre is fine.
Quoth is offline   Reply With Quote
Old 06-03-2024, 07:19 AM   #8
mblrdr
Enthusiast
mblrdr began at the beginning.
 
Posts: 32
Karma: 10
Join Date: Feb 2022
Device: none
Quote:
Originally Posted by JSWolf View Post
My laptop screen is 2560x1440 and I have Windows 11 at 125% scale. All versions of calibre 7 work without a problem.
Could you try 150%? And then try to switch?
Thx
mblrdr is offline   Reply With Quote
Old 06-03-2024, 07:31 AM   #9
JSWolf
Resident Curmudgeon
JSWolf ought to be getting tired of karma fortunes by now.JSWolf ought to be getting tired of karma fortunes by now.JSWolf ought to be getting tired of karma fortunes by now.JSWolf ought to be getting tired of karma fortunes by now.JSWolf ought to be getting tired of karma fortunes by now.JSWolf ought to be getting tired of karma fortunes by now.JSWolf ought to be getting tired of karma fortunes by now.JSWolf ought to be getting tired of karma fortunes by now.JSWolf ought to be getting tired of karma fortunes by now.JSWolf ought to be getting tired of karma fortunes by now.JSWolf ought to be getting tired of karma fortunes by now.
 
JSWolf's Avatar
 
Posts: 76,494
Karma: 136564766
Join Date: Nov 2006
Location: Roslindale, Massachusetts
Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3
Quote:
Originally Posted by mblrdr View Post
Could you try 150%? And then try to switch?
Thx
The problem could be that you are using two different scaling amounts. I suggest trying 125% or 150% on both monitors.
JSWolf is offline   Reply With Quote
Old 06-03-2024, 08:47 AM   #10
mblrdr
Enthusiast
mblrdr began at the beginning.
 
Posts: 32
Karma: 10
Join Date: Feb 2022
Device: none
Quote:
Originally Posted by JSWolf View Post
The problem could be that you are using two different scaling amounts. I suggest trying 125% or 150% on both monitors.
Single ThinkPad here (no external monitors). Just updated to newest Intel HD driver. Problem still there.
mblrdr is offline   Reply With Quote
Old 06-03-2024, 09:41 AM   #11
DNSB
Bibliophagist
DNSB ought to be getting tired of karma fortunes by now.DNSB ought to be getting tired of karma fortunes by now.DNSB ought to be getting tired of karma fortunes by now.DNSB ought to be getting tired of karma fortunes by now.DNSB ought to be getting tired of karma fortunes by now.DNSB ought to be getting tired of karma fortunes by now.DNSB ought to be getting tired of karma fortunes by now.DNSB ought to be getting tired of karma fortunes by now.DNSB ought to be getting tired of karma fortunes by now.DNSB ought to be getting tired of karma fortunes by now.DNSB ought to be getting tired of karma fortunes by now.
 
DNSB's Avatar
 
Posts: 40,603
Karma: 157444382
Join Date: Jul 2010
Location: Vancouver
Device: Kobo Sage, Libra Colour, Lenovo M8 FHD, Paperwhite 4, Tolino epos
Odd. I'm using a Thinkpad connected to it's internal display and an external display both with 125% scaling and I'm seeing no issues (the internal is using the Intel driver, the external uses the NVidia driver).
DNSB is offline   Reply With Quote
Old 06-03-2024, 10:34 AM   #12
Comfy.n
want to learn what I want
Comfy.n ought to be getting tired of karma fortunes by now.Comfy.n ought to be getting tired of karma fortunes by now.Comfy.n ought to be getting tired of karma fortunes by now.Comfy.n ought to be getting tired of karma fortunes by now.Comfy.n ought to be getting tired of karma fortunes by now.Comfy.n ought to be getting tired of karma fortunes by now.Comfy.n ought to be getting tired of karma fortunes by now.Comfy.n ought to be getting tired of karma fortunes by now.Comfy.n ought to be getting tired of karma fortunes by now.Comfy.n ought to be getting tired of karma fortunes by now.Comfy.n ought to be getting tired of karma fortunes by now.
 
Posts: 1,284
Karma: 6433040
Join Date: Sep 2020
Device: Calibre E-book viewer
As a last resort, I suggest disabling Qt scaling and see if that helps

see https://www.mobileread.com/forums/sh...d.php?t=348475

and

https://www.mobileread.com/forums/sh...d.php?t=351959
Comfy.n is offline   Reply With Quote
Old 06-12-2024, 04:39 PM   #13
mblrdr
Enthusiast
mblrdr began at the beginning.
 
Posts: 32
Karma: 10
Join Date: Feb 2022
Device: none
Quote:
Originally Posted by DNSB View Post
Odd. I'm using a Thinkpad connected to it's internal display and an external display both with 125% scaling and I'm seeing no issues (the internal is using the Intel driver, the external uses the NVidia driver).
Switching between Paged mode and Flow mode is not possible via either Settings nor via shortcut (ctrl+m) when Windows scaling is 150%. On 125% scaling everything is fine.

Could you double check?
mblrdr is offline   Reply With Quote
Old 06-13-2024, 07:54 PM   #14
Comfy.n
want to learn what I want
Comfy.n ought to be getting tired of karma fortunes by now.Comfy.n ought to be getting tired of karma fortunes by now.Comfy.n ought to be getting tired of karma fortunes by now.Comfy.n ought to be getting tired of karma fortunes by now.Comfy.n ought to be getting tired of karma fortunes by now.Comfy.n ought to be getting tired of karma fortunes by now.Comfy.n ought to be getting tired of karma fortunes by now.Comfy.n ought to be getting tired of karma fortunes by now.Comfy.n ought to be getting tired of karma fortunes by now.Comfy.n ought to be getting tired of karma fortunes by now.Comfy.n ought to be getting tired of karma fortunes by now.
 
Posts: 1,284
Karma: 6433040
Join Date: Sep 2020
Device: Calibre E-book viewer
Today I stumbled upon this option in MultiCommander file manager. Not sure if it is open-source and if this setting can be implemented in Calibre, since Calibre is cross-platform and depends on Qt:

Click image for larger version Name: MWSnap 2024-06-13, 19_29_48.png Views: 330 Size: 8.8 KB ID: 208853

(also, can't tell if this option would address the OP's issue)
Last edited by Comfy.n; 06-13-2024 at 08:11 PM.
Comfy.n is offline   Reply With Quote
Old 06-13-2024, 08:40 PM   #15
DNSB
Bibliophagist
DNSB ought to be getting tired of karma fortunes by now.DNSB ought to be getting tired of karma fortunes by now.DNSB ought to be getting tired of karma fortunes by now.DNSB ought to be getting tired of karma fortunes by now.DNSB ought to be getting tired of karma fortunes by now.DNSB ought to be getting tired of karma fortunes by now.DNSB ought to be getting tired of karma fortunes by now.DNSB ought to be getting tired of karma fortunes by now.DNSB ought to be getting tired of karma fortunes by now.DNSB ought to be getting tired of karma fortunes by now.DNSB ought to be getting tired of karma fortunes by now.
 
DNSB's Avatar
 
Posts: 40,603
Karma: 157444382
Join Date: Jul 2010
Location: Vancouver
Device: Kobo Sage, Libra Colour, Lenovo M8 FHD, Paperwhite 4, Tolino epos
Quote:
Originally Posted by mblrdr View Post
Switching between Paged mode and Flow mode is not possible via either Settings nor via shortcut (ctrl+m) when Windows scaling is 150%. On 125% scaling everything is fine.

Could you double check?
I tried setting the internal display to 150% and switching between paged and flow mode worked. I then switched the external monitor to 150% and, you guessed it, they still worked. Even with both displays at 150%, no issues other my screens seeming so low resolution.

One item that I haven;t seen mentioned is if you have updated your video driver(s).
Last edited by DNSB; 06-13-2024 at 08:43 PM.
DNSB is offline   Reply With Quote
Reply

Tags
125, calibre, display, scaling

« Previous Thread | Next Thread »

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Kindle Previewer doesn't support Calibre generated azw3/mobi xtraktor Calibre 3 02-12-2021 10:04 AM
Why in the hell doesn't Calibre support proper alphabetization after all these years? guspasho Calibre 9 04-26-2018 03:31 PM
Why doesn't Calibre support doc files? Steven630 Conversion 3 06-06-2012 01:30 AM
Calibre doesn't support ".doc" files? megacoupe Calibre 11 11-13-2009 04:38 AM
any2xxx, lrf2xxx not working in calibre 0.4.125 (and earlier versions) Oletros Calibre 2 01-04-2009 01:54 PM


All times are GMT -4. The time now is 03:46 PM.

Contact Us - FAQ - Guidelines - Privacy - Top

MobileRead.com is a privately owned, operated and funded community.