Darken Reader display on Linux

John Wood · 07-01-2022, 05:59 AM

A dark theme can be quickly set for the book, but then the table of contents and bookmarks are still very light. That can be very annoying and it would be good if that could be changed.

I have already asked in a Linux forum. There I was recommended the commands:
sudo apt install qt5ct qt5-style-plugins
export QT_QPA_PLATFORMTHEME=gtk2
export QT_QPA_PLATFORMTHEME=qt5ct

But hasn't changed anything. They said someone here would know how to do it

I use Xubuntu. If more information is missing, please ask. Thanks for the help.

kovidgoyal · 07-01-2022, 06:14 AM

export CALIBRE_USE_DARK_PALETTE=1

John Wood · 07-01-2022, 09:30 AM

That works very well, thanks for that. But I always start caliber from a launcher icon. If I now change the command for the starter to "export CALIBRE_USE_DARK_PALETTE=1 & calibre" I get the error message: Command ... could not be executed. Child process ... could not be run (file or directory not found). Which command does the starter need?

DiapDealer · 07-01-2022, 09:46 AM

If you're using it as part of a launch command, then ditch the 'export' and the &. Just use something like:

CALIBRE_USE_DARK_PALETTE=1 calibre

The 'export' makes it semi-permanent (for the duration of the current open terminal say). That's better for use in a .profile file or the like. The Calibre binary clearly needs to be in your PATH using the the above start command.

John Wood · 07-03-2022, 07:51 AM

I can't make it Maybe the picture will help.

Click image for larger version

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readx · 07-03-2022, 09:37 AM

go to your /home/USER/ folder
edit .profile (create it if it does not exist)
add the following lines:

Code:

export CALIBRE_USE_SYSTEM_THEME=0
export CALIBRE_USE_DARK_PALETTE=1

save, logout, login and open calibre. Dark theme should be enabled

John Wood · 07-05-2022, 08:50 AM

Thank you, problem solved

07-01-2022, 05:59 AM	#1
John Wood Junior Member Posts: 6 Karma: 10 Join Date: Jul 2022 Device: kindle paperwhite	Darken Reader display on Linux A dark theme can be quickly set for the book, but then the table of contents and bookmarks are still very light. That can be very annoying and it would be good if that could be changed. I have already asked in a Linux forum. There I was recommended the commands: sudo apt install qt5ct qt5-style-plugins export QT_QPA_PLATFORMTHEME=gtk2 export QT_QPA_PLATFORMTHEME=qt5ct But hasn't changed anything. They said someone here would know how to do it I use Xubuntu. If more information is missing, please ask. Thanks for the help.

07-03-2022, 07:51 AM	#5
John Wood Junior Member Posts: 6 Karma: 10 Join Date: Jul 2022 Device: kindle paperwhite	I can't make it Maybe the picture will help. Last edited by BetterRed; 07-03-2022 at 09:01 AM. Reason: image too big - see Guidelines

07-03-2022, 09:37 AM	#6
readx Connoisseur Posts: 94 Karma: 118402 Join Date: Jul 2009 Device: Cybook Gen3	go to your /home/USER/ folder edit .profile (create it if it does not exist) add the following lines: Code: export CALIBRE_USE_SYSTEM_THEME=0 export CALIBRE_USE_DARK_PALETTE=1 save, logout, login and open calibre. Dark theme should be enabled

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07-01-2022, 06:14 AM	#2
kovidgoyal creator of calibre Posts: 45,373 Karma: 27230406 Join Date: Oct 2006 Location: Mumbai, India Device: Various	export CALIBRE_USE_DARK_PALETTE=1

07-01-2022, 09:30 AM	#3
John Wood Junior Member Posts: 6 Karma: 10 Join Date: Jul 2022 Device: kindle paperwhite	That works very well, thanks for that. But I always start caliber from a launcher icon. If I now change the command for the starter to "export CALIBRE_USE_DARK_PALETTE=1 & calibre" I get the error message: Command ... could not be executed. Child process ... could not be run (file or directory not found). Which command does the starter need?

07-01-2022, 09:46 AM	#4
DiapDealer Grand Sorcerer Posts: 28,585 Karma: 204624552 Join Date: Jan 2010 Device: Nexus 7, Kindle Fire HD	If you're using it as part of a launch command, then ditch the 'export' and the &. Just use something like: CALIBRE_USE_DARK_PALETTE=1 calibre The 'export' makes it semi-permanent (for the duration of the current open terminal say). That's better for use in a .profile file or the like. The Calibre binary clearly needs to be in your PATH using the the above start command.

07-05-2022, 08:50 AM	#7
John Wood Junior Member Posts: 6 Karma: 10 Join Date: Jul 2022 Device: kindle paperwhite	Thank you, problem solved

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