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larrymohr · 07-26-2011, 01:10 AM

Jack,

I'm not sure at this point that you still want your original question answered since it likely does not have anything to do with covers displaying or not displaying on the Kobo but here is something I have found out.
The Kobo generates 4 image files that it uses itself.
The sizes are(in pixels):
FULL 355x530
GRID 149x223
LIST 60x90
SOCIAL 120x96
The names to the left are part of the original filenames.
I am assuming that FULL is the image used when sleeping or off.
Grid is the size used for the most recent book being read and probably the cover only view.
List is the size used for the thumbnail and titles view.
Social is probably used for the Reading stats stuff.

I have made a few 355x530 covers and they look nice and sharp on the sleep screen. However, it is also true that at some point you will end up with a reader that has higher resolution. If you were to create 600x800 pixel covers they should look fine on the current KOBO and will also look good on any reader up to about 1200x1600 pixels which should cover things for some time in the future.

One last thing to take into account is that the larger the cover image dimensions, the larger the file. Some cover images could be larger than the ePub itself.

Hope this helps.

Larry J.

07-26-2011, 01:10 AM	#42
larrymohr Zealot Posts: 104 Karma: 29873 Join Date: Jul 2010 Location: Surrey, B.C. Device: Kobo Libra Color, Kobo Sage, AURA One, Mini	Image sizes for Kobo ePub covers Jack, I'm not sure at this point that you still want your original question answered since it likely does not have anything to do with covers displaying or not displaying on the Kobo but here is something I have found out. The Kobo generates 4 image files that it uses itself. The sizes are(in pixels): FULL 355x530 GRID 149x223 LIST 60x90 SOCIAL 120x96 The names to the left are part of the original filenames. I am assuming that FULL is the image used when sleeping or off. Grid is the size used for the most recent book being read and probably the cover only view. List is the size used for the thumbnail and titles view. Social is probably used for the Reading stats stuff. I have made a few 355x530 covers and they look nice and sharp on the sleep screen. However, it is also true that at some point you will end up with a reader that has higher resolution. If you were to create 600x800 pixel covers they should look fine on the current KOBO and will also look good on any reader up to about 1200x1600 pixels which should cover things for some time in the future. One last thing to take into account is that the larger the cover image dimensions, the larger the file. Some cover images could be larger than the ePub itself. Hope this helps. Larry J.