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Old 09-03-2017, 02:16 PM   #1
mgrimace
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Posts: 93
Karma: 1255124
Join Date: Feb 2013
Location: Ontario, Canada
Device: Kobo Libra Colour, Kobo Libra 2, Kobo Libra H2O, Kindle Oasis 9
Kobo Aura One screensaver cover low-res?

Hello,

My issue: After sending a book over, it seems to generate a lower resolution screensaver cover, regardless of the image size in Calibre.

The cover image inside the book on the KA1 is high resolution (i.e., the image that shows up when I start the book on the device), but the screensaver image is jagged and artifact-y, clearly upscaled.

My setup:
High resolution cover images in calibre library
Calibre output settings on 'tablet'
Followed the 'Shelves and collections' wiki to set up Calibre for the KA1
Kobotouchextended driver (output to kepub, my preferred format), conversion to kepub is done on-the-fly when sending to device, options selected:
  • Upload covers - selected
  • keep cover aspect ratio - selected (also tried not selected, no quality difference other than image stretched to fill screen)
  • black and white - not selected (also tried selected, no difference)
Other things I've tried:
- manually upload covers via Kobo Utilities plugin - no difference
- kobotouch driver (output also set to kepub) - same issue with 'upload covers' selected

Seems to be an issue with the kt/kte driver. Maybe a plugin conflict, setting, or something I'm missing, any ideas?

SOLUTION, via Davidfor:
Open the preferences and select "Tweaks" near the bottom of the screen. Select the "maximum_cover_size" tweak in the list on the left to see the value. Hit it the "Reset This Tweak" value to go back to the default.

~M

Last edited by mgrimace; 09-04-2017 at 08:52 PM. Reason: clarity, solution added
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