[Conversion Plugin] KFX Input

[tomsem]

Originally Posted by jhowell

Thanks again.

Would it be possible to also post screenshots of the pages with highligher overlays for comparison with the exported PDF? I am having trouble getting the color saturation correct for those.

I'll do a new set, starting with highlighter examples since it is simpler: fixed saturation (50%?) and only 5 colors. But there are a lot of combinations to explore:

(5, 1) = 5 combinations of 1 color
(5, 2) = 10 combinations of 2 colors
(5, 3) = 10 combinations of 3 colors
(5, 4) = 5 combinations of 4 colors
(5, 5) = 1 combination with all 5 colors

Total 31 combinations on white background.

Then these need to be placed on top of each of the 10 fill colors (except black).

So 31 + 31 x 9 = 310 combinations, some not unique since the fill color will cancel out a same colored highlight and it should look same as having one less highlight color applied.

---

Shader tool is considerably more complex: 10 colors, saturation is built up with successive strokes, maybe each stroke adds 10% or so?

Likely many of these combinations are indistinguishable from each other, particularly as more strokes are applied. At some point, it will look just like Pen/Fountain Pen/Marker tool's fully saturated color. At mid-saturation levels, like highlighter.

So it seems lighter saturation levels might be place to start with for tuning. If it even seems feasible.

(Shapes appear to be on their own layer, between background and the one used for drawing.)

[Anson]

Hi everyone,

​I'm a new Kindle user (just got the Paperwhite 12th Gen Signature Edition) and I'm currently migrating my library to the KFX format for the Enhanced Typesetting features.

​While most conversions are successful, I'm encountering a persistent error with a subset of my Chinese novels:

​"Conversion error: Kindle conversion has encountered an internal error while enabling Enhanced Typesetting on this book."

​My Workflow:
​

1. Source: EPUB (originally Simplified Chinese).
2. ​Translation: Using the 'Chinese Text Conversion' plugin to convert from Simplified to Traditional Chinese.
3. ​Layout: Setting text direction from Horizontal to Vertical (vertical-rl) via the plugin's "Vertical" option.
4. ​Conversion: Using the KFX Output plugin with Kindle Previewer installed.

​Observations:
​

1. Books that are only translated (Simplified to Traditional) but kept in Horizontal layout convert to KFX without any issues.
2. ​The error only triggers when I attempt to enable the Vertical layout for specific titles.
3. ​I have already tried fixing CSS errors (duplicate selectors/invalid properties) and ensuring the language metadata is set to zh-TW or zho, but the error persists.

​Has anyone encountered this specific conflict between vertical Chinese layouts and KFX's Enhanced Typesetting? Are there any specific HTML/CSS requirements for vertical text that I might be missing?

​Any help or guidance would be greatly appreciated! Thanks in advance.

[jhowell]

Originally Posted by tomsem

I'll do a new set, starting with highlighter examples since it is simpler: fixed saturation (50%?) and only 5 colors. But there are a lot of combinations to explore:

I don't need a lot of samples just a few colored squares with some colored highlighter marks that overlap them. The issue is more with getting the highlighter opacity to work properly. I need the screenshot to provide what the accurate colors should be without the flattening of colors that appear in the exported PDF.

[tomsem]

The five highlight colors on nine shape fill colors (excluding Black)

[jhowell]

Originally Posted by tomsem

The five highlight colors on nine shape fill colors (excluding Black)

I am going to release the plugin update. It handles the smart shapes well as far as I can tell. There are still some minor inconsistencies in how the shader is rendered, but it is not too noticeable.

Let me know if you discover any significant problems.

[jhowell]

Version 2.31.0 - 23 Apr 2026

Allow conversion of Scribe notebooks that contain Smart Shapes.

The plugin configuration option "Desaturate colors when converting Scribe Colorsoft notebooks" will mute the colors to better match the files produced by Amazon when exporting them as PDF.

[daddyjones]

Having (probably unnecessarily) installed the latest version in calibre - I now get all attempts to import books resulting in a KFX-ZIP file. I know this is an issue with the drm removal, but it worked with the previous version. I have dedrm_tools 10.0.9 installed - I don't think there is a later one?

Anyway - has something changed in the latest version that breaks working with dedrm, or is there a way to downgrade?

[daddyjones]

Updated to the latest version and it's no longer working with DeDrm - which the last version was. Has something changed which might break that - or is there any way I can revert to the previous version?

[pdurrant]

It's not KFX Input or DeDRM that's changed. Amazon has changed the KFX DRM.

[jhowell]

Originally Posted by daddyjones

Having (probably unnecessarily) installed the latest version in calibre - I now get all attempts to import books resulting in a KFX-ZIP file. I know this is an issue with the drm removal, but it worked with the previous version. I have dedrm_tools 10.0.9 installed - I don't think there is a later one?

Anyway - has something changed in the latest version that breaks working with dedrm, or is there a way to downgrade?

None of the recent changes in this plugin should affect DRM removal and as pdurrant pointed out Amazon has updated that recently so it is likely a coincidence that you started seeing KFX-ZIP after you updated the plugin.

However just in case I missed something I am attaching the previous plugin version (2.30.0) to this post for a limited time so that you can download and install it in calibre. Please report back if that solves your problem so that I can research what is going wrong and correct it.

[daddyjones]

Thanks - I'll give that a go and report back.

BTW - apologies for posting twice. I didn't think it had worked the first time.

[daddyjones]

Problem still there with the old version - so you guys are probably right about it just being bad timing.

Ah well - hopefully someone will figure it out soon, but who knows?

Thanks for the replies anyway.

[jhowell]

Some methods of removing Kindle DRM are still possible. See the first post in the thread Dealing with Kindle ebooks in calibre for the latest information.

[Mamaijee]

I installed the plugin KFX Input (2.31.0) by jhowell and added a book from my paperwhite but it still shows up as KFX-Zip. I thought that after the latest plugin it would deal with the zip problem.

Am quite an ignoramus any help will be appreciated

mamaijee

[texasnightowl]

KFX Input only allows kfx format to be imported to calibre. It does not remove the drm which has to happen before kfx input can do anything with them. You should review the first post here: https://www.mobileread.com/forums/sh...d.php?t=361503

Also...what you can do...or IF you can do anything depends on which version your paperwhite is and which firmware it is running.