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I got the AZW3 (Download & transfer via USB) and KFX (Kindle for PC 2.4.0) versions of "Quiz Game Book: Trivia Questions With Answers" from Amazon Japan and converted them to EPUB using "KindleUnpack" and "From KFX". The JPEGs of the cover page differ significantly:
[AZW3]
File size: 122,376 bytes
Image size: 1439 x 2290 pixels
JPEG compression: Quality 40
Number of colors: 41,390
[KFX]
File size: 297,173 bytes
Image size: 1207 x 1920 pixels
JPEG compression: Quality 100
Number of colors: 9,992
The picture quality from the AZW3 file looks better than from the KFX file. Is it possible to restore the original JPEGs?
Otherwise, is it possible to reduce the JPEG compression quality to reduce the file size? The file size becomes less than half if 100% is changed to 85%.
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