Quote:
Originally Posted by Hitch
Sorry: why do you think that the KF8 file is smaller than the "classic MOBI" file?
Hitch
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Amazon adds extra JPG compression to images in KF8 files. So in this example, a cookbook which used to take up 62MB (because of all the photos of ingredients, recipes etc.) in the "classic MOBI" format now takes up only 14MB as a KF8 file. The same cookbook still takes up 62MB in other ebook stores that use EPUB.
In the link I posted, I gave an example of the same pictures from an EPUB (mouse out) and from a KF8 file (mouse over the photo). The compression isn't very bad so you normally don't see a big difference in image quality.
However when you look closely, you will see that there is a difference. Hold down Ctrl and press + a few times to zoom in. It's easiest to notice in picture #2 if you look at the background. When you mouse over the image you will immediately see that there is a completely different background texture. Look, this is the top-left corner of picture #2:
The difference in picture quality isn't really a problem during normal viewing, especially on a black&white e-ink reader. However if the ebook you're publishing is very reliant on pictures, you should still keep this in mind.