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Old 03-11-2019, 08:50 AM   #3
jhowell
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Posts: 6,498
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Join Date: Nov 2011
Location: Tampa Bay, Florida
Device: Kindles
In my testing using a Kindle Oasis 2 with 5.10.3 firmware, books in KF8 (azw3) format are shown with a white border around the cover and books in KFX (enhanced typesetting) format are shown with a black cover border.

These samples are in landscape mode. The first book is KF8 and the second is KFX.

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Added: This is basically out of your control. The various Kindle apps, devices and firmware versions may produce different results.
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Last edited by jhowell; 03-11-2019 at 10:08 AM.
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