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Originally Posted by SVII
There are just a few small things that i don't understand, mainly about the landmark elements of the toc/nav and a discrepancy between the results i get from converting the epub directly with Kindle previewer (v3.38) and the results i get from converting them with this plugin and reading them on my kindle (paperwhite 10th gen).
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It is not surprising that you get different results using those two different methods.
The calibre conversion pipeline makes a lot of changes to the original book. Books are first converted to an internal format based on EPUB 2. Then a number of manipulations are done on the book that can include cover replacement, image rescaling, and HTML reformatting. The result of that is then passed to the conversion output plugin, KFX Output in this case. KFX Output converts the intermediate format to an EPUB 2 file and then passes that to the Kindle Previewer to generate a KPF file that is then repackaged into the final KFX file.
Some of the changes that calibre makes during conversion can be avoided by using the proper settings, others are unavoidable. If you want the KFX file to reflect your original source file as closely as possible then either convert to KPF using the Kindle Previewer, as you have done, and use the command line interface to the KFX Output plugin. That will bypass the calibre conversion pipeline.
Quote:
Originally Posted by SVII
Another curiosity about images, it seems to me like the images in the kfx book are getting converted from rgb to grayscale (instead of simply making it a black and white rgb mode jpg) and gaining quite a bit of brightness in the process. Is it just my impression?
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Color images converted by the Kindle Previewer are left RGB, but may be rescaled and converted to JPEG if not already in that format. The plugin makes no further manipulation of images. The Kindle firmware has to map them to the Kindle's grayscale display. I don't know any of the details of that.