|
Sometimes the images are very important. And the book becomes unusable if they are scaled down. Then you may not want to scale them. Sometimes they are not very important at all. Then you can scale them. This was why I suggested you save a backup copy of the book...
In this case I suspect the book is scanned but not OCR:d.
I once had an 6MB epub with a huge cover image in PNG. The rest of the book was perhaps 150kB. I scaled down the cover to a more reasonable size, 1920x1080, and converted to jpeg and the whole book then was less than 300 kB.
|