Quote:
Originally Posted by risho
When you convert a kfx manga to cbz using from kfx is this a lossless conversion or are you re-encoding the images? I'm noticing that the images coming from the kfx book are a different size (and naming scheme, jpg instead of jpeg) than what i get from converting the older style azw3 (pre 2023 change books).
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This is from the
Alternatives to KFX notes in the first post:
Quote:
Generally the highest quality graphics that Amazon makes available are delivered in KFX format to recent versions of the iOS/Mac and Android apps. The next best image quality can be obtained with a KF8 (AZW3) format book along with an HD image container file (AZW6) obtained for some books using Kindle for PC or an older version of the Android app. A bit worse is a standalone KF8 file obtained from one of those apps or by using the Download & Transfer function of Amazon's web site. Recent versions of Kindle for PC will deliver books in KFX format with graphics quality somewhere between the highest possible and KF8 equivalent depending on the particular book. Worst of all is the image quality in books downloaded directly by Kindle devices in KFX format, which are typically black and white with low resolution.
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I have been doing a lot of this conversion lately, as part of converting comics I've purchased from Amazon to other formats (ePub/PDF/CBZ) for reading on other devices. (I actually prefer ePub or PDF as they can have a ToC).
I greatly prefer KFX (since getting around to installing Kindle for PC) as the conversion to ePub/PDF/CBZ is very reliable and simple compared to trying to do the same from AZW3. (Kindle Classic for Mac does not deliver a file that KFX import can process for any comics or manga -- they have 'kcr' file extension). I have not tried to get older Mac versions which might allow this.)
Generally the images are essentially the same, but for example AZW3 will have 1249 pixels wide where the KFX has 1250. And the images in CBZ-from-KFX are a little larger than those exported by KindleUnpack (94.5 MB vs 83.3 MB in the one I checked), indicating less aggressive compression.
There's no signifcance to the naming of the image files.