KFX Format - Page 46

jhowell · 11-03-2017, 08:24 AM

Quote:

Originally Posted by AcidWeb

@jhowell - During your adventures inside maws of KFXGenApp did you find any references to "Preview Double Page Spread" feature?

It is undocumented and despite my diligent search I can't find what code triggers it.

I have never heard of or seen anything like that. Where did you come across it?

AcidWeb · 11-03-2017, 08:40 AM

This is one of new KFX manga features. There is option to enable it in book settings directly on Kindle.

http://www.youtube.com/watch?v=MEoNXG80iSY&t=0m25s
That box on bottom on double spread pages.

EDIT:
OK. I got it.. partially. As expected this feature is controlled by page-spread-* properties in OPF spine and require unlocked orientation-lock. But that is not enough. It is somewhat connected with size of both images. If they pass some magical limit preview kick in.

I don't know that limit yet.
Additionally books created by Kindle Comic Creator don't trigger it too.

Publishers of this type of content must have access to some additional specifications as
Amazon Kindle Publishing Guidelines just don't describe it at all.

jhowell · 11-03-2017, 11:39 AM

Quote:

Originally Posted by AcidWeb

This is one of new KFX manga features. There is option to enable it in book settings directly on Kindle.
http://www.youtube.com/watch?v=MEoNXG80iSY&t=0m25s
That box on bottom on double spread pages.

Well call me clueless! I don't use my kindle for reading manga so I never noticed that the Aa menu is completely different for those.

AcidWeb · 11-03-2017, 01:04 PM

I got it.

Besides things I pointed out in my post above image dimensions (file itself) need to have the same ratio as value set in original-resolution meta field and image can't have any margins.

Next crumb of knowledge torn from the throat of KFX.

AcidWeb · 11-05-2017, 05:14 AM

Generally after the last few days of study I have to say that I consider KFX very inflexible. KF8 had way way more wiggle room and some rules could be bend.

With KFX is it more like: Do it our way or not at all.

jhowell · 11-09-2017, 11:18 AM

Quote:

Originally Posted by AcidWeb

This is one of new KFX manga features. There is option to enable it in book settings directly on Kindle.

http://www.youtube.com/watch?v=MEoNXG80iSY&t=0m25s
That box on bottom on double spread pages.

I forgot to ask previously, do you know what the "Animation" option is for in the Aa menu when reading manga?

It has always been grayed out in the ones I have tried.

AcidWeb · 11-09-2017, 11:50 AM

I never seen it enabled. And it is not KFX feature. KF8 reader have it too.

JSWolf · 11-09-2017, 12:20 PM

Quote:

Originally Posted by AcidWeb

I never seen it enabled. And it is not KFX feature. KF8 reader have it too.

I'm not sure that KF8 has it or not. When reading KF8 on 5.8.11 or later, the Aa menu shows the option to left justify and with KF8 it doesn't work.

AcidWeb · 11-09-2017, 12:22 PM

It is displayed only if comic flag is set in in e-book metadata.

jhowell · 11-30-2017, 04:24 PM

Kindle Previewer version 3.17 has been released. The main change was adding support for MathML in KFX format.

The Previewer uses MathJax to convert MathML to SVG for display purposes. It also includes the original MathML markup as a hidden annotation for use by screen readers.

I have attached a sample EPUB containing a MathML equation. When opened using KPR 3.17 the equation is rendered correctly.

Only the Enhanced Typesetting (KFX format) renders MathML correctly. The MOBI file produced shows the equation garbled because kindlegen ignores the MathML markup.

I would not be surprised to see the Amazon Kindle Publishing Guidelines updated to allow MathML sometime soon.

jcsalomon · 11-30-2017, 07:24 PM

Quote:

Originally Posted by jhowell

The Previewer uses MathJax to convert MathML to SVG for display purposes. It also includes the original MathML markup as a hidden annotation for use by screen readers.
[…]
Only the Enhanced Typesetting (KFX format) renders MathML correctly. The MOBI file produced shows the equation garbled because kindlegen ignores the MathML markup.

Interesting combination, seeing as right now SVG content prevents Enhanced Typesetting.

jhowell · 12-01-2017, 07:55 AM

Quote:

Originally Posted by jcsalomon

Interesting combination, seeing as right now SVG content prevents Enhanced Typesetting.

KFX supports a binary encoded subset of SVG that Amazon calls KVG. The KFX generator in KPR 3.17 converts the SVG produced by MathJax into KVG.

Doitsu · 12-01-2017, 08:46 AM

Quote:

Originally Posted by jhowell

Kindle Previewer version 3.17 has been released. The main change was adding support for MathML in KFX format. [...]
Only the Enhanced Typesetting (KFX format) renders MathML correctly. The MOBI file produced shows the equation garbled because kindlegen ignores the MathML markup.

According to the Kindle Publishing Guidelines, only amzn-mobi and amzn-kf8 can be used in media queries.
Did you stumble upon a new media query for KFX-only features, e.g. amzn-kfx?

jhowell · 12-01-2017, 09:45 AM

Quote:

Originally Posted by Doitsu

Did you stumble upon a new media query for KFX-only features, e.g. amzn-kfx?

I haven't seen any sign of a media query that targets KFX and I don't expect it to be added. Amazon does not mention the KFX format in the Publishing Guidelines at all.

It seems more likely to me that books containing MathML will be restricted to devices that support Enhanced Typesetting. (Indic language books already have this restriction.)

jhowell · 12-07-2017, 09:02 PM

Amazon has released version 8.1 of the Kindle for Android app and one of the new features is "free Kindle dictionaries for five new languages – Hindi, Tamil, Marathi, Gujarati, and Malayalam."

Although I don't read the language, I tried doing a dictionary lookup in Hindi for testing. When I checked the app storage I saw that the Hindi dictionary was downloaded in a new variant of KFX format. It is a SQLite database containing content encrypted by KFX DRM.

I wonder if this new Kindle dictionary format will be used for other languages going forward.

11-03-2017, 08:40 AM	#677
AcidWeb KCC Co-Author Posts: 845 Karma: 765434 Join Date: Mar 2013 Location: Poland Device: Kindle Oasis 2	This is one of new KFX manga features. There is option to enable it in book settings directly on Kindle. http://www.youtube.com/watch?v=MEoNXG80iSY&t=0m25s That box on bottom on double spread pages. EDIT: OK. I got it.. partially. As expected this feature is controlled by page-spread-* properties in OPF spine and require unlocked orientation-lock. But that is not enough. It is somewhat connected with size of both images. If they pass some magical limit preview kick in. I don't know that limit yet. Additionally books created by Kindle Comic Creator don't trigger it too. Publishers of this type of content must have access to some additional specifications as Amazon Kindle Publishing Guidelines just don't describe it at all. Last edited by AcidWeb; 11-03-2017 at 12:13 PM.

11-03-2017, 01:04 PM	#679
AcidWeb KCC Co-Author Posts: 845 Karma: 765434 Join Date: Mar 2013 Location: Poland Device: Kindle Oasis 2	I got it. Besides things I pointed out in my post above image dimensions (file itself) need to have the same ratio as value set in original-resolution meta field and image can't have any margins. Next crumb of knowledge torn from the throat of KFX. Last edited by AcidWeb; 11-03-2017 at 01:42 PM.

11-05-2017, 05:14 AM	#680
AcidWeb KCC Co-Author Posts: 845 Karma: 765434 Join Date: Mar 2013 Location: Poland Device: Kindle Oasis 2	Generally after the last few days of study I have to say that I consider KFX very inflexible. KF8 had way way more wiggle room and some rules could be bend. With KFX is it more like: Do it our way or not at all. Last edited by AcidWeb; 11-05-2017 at 01:21 PM.

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11-09-2017, 11:50 AM	#682
AcidWeb KCC Co-Author Posts: 845 Karma: 765434 Join Date: Mar 2013 Location: Poland Device: Kindle Oasis 2	I never seen it enabled. And it is not KFX feature. KF8 reader have it too.

11-09-2017, 12:22 PM	#684
AcidWeb KCC Co-Author Posts: 845 Karma: 765434 Join Date: Mar 2013 Location: Poland Device: Kindle Oasis 2	It is displayed only if comic flag is set in in e-book metadata.

12-07-2017, 09:02 PM	#690
jhowell Grand Sorcerer Posts: 6,494 Karma: 84420419 Join Date: Nov 2011 Location: Tampa Bay, Florida Device: Kindles	Amazon has released version 8.1 of the Kindle for Android app and one of the new features is "free Kindle dictionaries for five new languages – Hindi, Tamil, Marathi, Gujarati, and Malayalam." Although I don't read the language, I tried doing a dictionary lookup in Hindi for testing. When I checked the app storage I saw that the Hindi dictionary was downloaded in a new variant of KFX format. It is a SQLite database containing content encrypted by KFX DRM. I wonder if this new Kindle dictionary format will be used for other languages going forward.