Extend covers to full screen on sleep

Buhaj · 10-26-2025, 10:39 AM

I have book covers set as sleep screen, most of them are in a format that does not cover full screen, there are bars on each side. I have cover extension set to active, but I guess it only works when a custom message is set to top/bottom of the screen - I have it set to the middle.

How best to resize covers so that they show full screen, and can it be done without reloading whole books? I use Calibre/Koreader Sync.

hius07 · 10-26-2025, 11:50 AM

Try the sleep screen setting "Stretch cover to fit screen".

JSWolf · 10-26-2025, 12:35 PM

If you have the covers be full screen, the aspect ratio will be off and look so.

Buhaj · 11-01-2025, 12:21 PM

Stretching covers helped indeed, I had to increase the default level of 8% for some books to cover the whole screen. It does not look bad either, definitely better than the original view in my opinion.
Pity Koreader cannot zoom aside from stretching covers.

Ebookus · 11-01-2025, 01:23 PM

Koreader actually does a bit more than stretching though (even if not documented in front end). Before the stretching happens, it adjusts the starting size, (zooms in or out accordingly) and then applies the strech.

jackm8 · 11-04-2025, 02:36 PM

Modify covers so they fill full screen before you upload them to the device. You get the best image quality that way.

JSWolf · 11-04-2025, 03:12 PM

The best image quality is a hi-res image that keeps the correct aspect ratio.

10-26-2025, 10:39 AM	#1
Buhaj Groupie Posts: 185 Karma: 278068 Join Date: Dec 2014 Location: Poland Device: Kobo Libra 2 & Sage, Kindle PW3	Extend covers to full screen on sleep I have book covers set as sleep screen, most of them are in a format that does not cover full screen, there are bars on each side. I have cover extension set to active, but I guess it only works when a custom message is set to top/bottom of the screen - I have it set to the middle. How best to resize covers so that they show full screen, and can it be done without reloading whole books? I use Calibre/Koreader Sync.

11-04-2025, 02:36 PM	#6
jackm8 Addict Posts: 370 Karma: 4500000 Join Date: Nov 2015 Device: none	Modify covers so they fill full screen before you upload them to the device. You get the best image quality that way. Last edited by jackm8; 11-04-2025 at 03:04 PM.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Libra 2 Full-screen spanned covers using CW and kobo sync	mgrimace	Kobo Developer's Corner	1	03-13-2024 07:44 PM
Is there a way to extend the Oasis's screen timeout?	Argon	Amazon Kindle	6	06-18-2020 09:59 AM
Full screen covers on Nexus 10	dutchie1	Devices	25	03-05-2014 09:55 PM
covers disappear after 'sleep'	machstem	Kobo Reader	3	01-04-2014 11:08 AM
Sleep mode or full power off (Kindle 3)?	JoshLessard	Amazon Kindle	8	12-11-2010 11:19 AM

10-26-2025, 11:50 AM	#2
hius07 Wizard Posts: 1,192 Karma: 3592927 Join Date: Sep 2014 Location: Ukraine Device: Kindle	Try the sleep screen setting "Stretch cover to fit screen".

10-26-2025, 12:35 PM	#3
JSWolf Resident Curmudgeon Posts: 80,789 Karma: 150249619 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3	If you have the covers be full screen, the aspect ratio will be off and look so.

11-01-2025, 12:21 PM	#4
Buhaj Groupie Posts: 185 Karma: 278068 Join Date: Dec 2014 Location: Poland Device: Kobo Libra 2 & Sage, Kindle PW3	Stretching covers helped indeed, I had to increase the default level of 8% for some books to cover the whole screen. It does not look bad either, definitely better than the original view in my opinion. Pity Koreader cannot zoom aside from stretching covers.

11-01-2025, 01:23 PM	#5
Ebookus Digital Grenadier Posts: 211 Karma: 2500000 Join Date: Jan 2024 Device: Kindle	Koreader actually does a bit more than stretching though (even if not documented in front end). Before the stretching happens, it adjusts the starting size, (zooms in or out accordingly) and then applies the strech.

11-04-2025, 03:12 PM	#7
JSWolf Resident Curmudgeon Posts: 80,789 Karma: 150249619 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3	The best image quality is a hi-res image that keeps the correct aspect ratio.

Advert

Advert