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