What is the best way to change the embedded fonts?

bookman156 · 03-26-2016, 04:10 PM

The EPUB I'm editing that I received from a publisher has embedded fonts. If I wanted to change these, is there a good way to do it in Sigil?

I know I can unzip the EPUB and manually place the fonts in the font folder and change references in the CSS and wherever else, but is there a more automated way to do it in Sigil?

theducks · 03-26-2016, 04:15 PM

You can use ADD EXISTING for Fonts as well as CSS, HTML, Images

As you fiqured... Editing/adding @fonts will be necessary

DiapDealer · 03-26-2016, 04:19 PM

I don't know about automated per se, but yes, you should be able to do it a little bit easier from within Sigil.

You can add new font files to your epub by using File->Add->Existing Files (or right clicking on a folder in Book View and selecting "Add Existing Files" from the context menu).

You can then manually change the CSS font-face declarations to use your new font files and then delete the old fonts (right click on them in Book View).

Saves you the trouble of unzipping/rezipping anyway.

bookman156 · 03-26-2016, 04:22 PM

Quote:

Originally Posted by theducks

You can use ADD EXISTING for Fonts as well as CSS, HTML, Images

Ah, I didn't realise that. So I don't have to unzip it at least. I can edit the CSS easily enough to pick up the new fonts, but will this be picked up by content.opf automatically or do I have to edit that as well?

DiapDealer · 03-26-2016, 04:24 PM

Quote:

Originally Posted by bookman156

Ah, I didn't realise that. So I don't have to unzip it at least. I can edit the CSS easily enough to pick up the new fonts, but will this be picked up by content.opf automatically or do I have to edit that as well?

The files will be manifested/removed from the OPF for you.

bookman156 · 03-26-2016, 04:25 PM

Excellent. Thank you both.

bookman156 · 03-26-2016, 04:46 PM

While I'm on fonts, can I just check whether the 'Font Obfuscation' method chosen (currently I have none) is just for viewing in Sigil or whether it adds anything to the EPUB itself?

bookman156 · 03-26-2016, 04:49 PM

I think I've misunderstood the term 'obfuscation' here. I was thinking something like how Photoshop sharpens fonts, but it is an entirely different matter altogether.

DiapDealer · 03-26-2016, 05:37 PM

Yes. Font obfuscation is a way of encrypting fonts so they're unusable should someone extract them from the epub and try to use them. It's not all that effective, but it may be required depending on the license you have to distribute a font (if a license is indeed required).

You can right-click on a font-file in the Book Browser and quickly see if they have a form of obfuscation on them (no check mark beside either of the obfuscation methods means no obfuscation).

Just remember that there can be no obfuscation on fonts in an epub you're going to convert to a Kindlebook with kindlegen/kindle-previewer.

bookman156 · 03-26-2016, 05:57 PM

Quote:

Originally Posted by DiapDealer

Just remember that there can be no obfuscation on fonts in an epub you're going to convert to a Kindlebook with kindlegen/kindle-previewer.

Presumably if a proprietary font is used it could be subsetted with Calibre and so not need to be obfuscated?

I will need to look more into this, but I think OpenSource fonts should be fine.

DiapDealer · 03-26-2016, 06:09 PM

Quote:

Originally Posted by bookman156

Presumably if a proprietary font is used it could be subsetted with Calibre and so not need to be obfuscated?

That all depends on the individual font and its licensing requirements. Even some "Free" fonts won't allow you to modify them and distribute them under their original name.

But, yes, open source fonts should be fine (though I admit I'm no expert).

bookman156 · 03-26-2016, 06:18 PM

I see that Google now has all languages covered with free fonts:

http://www.google.com/get/noto/

On the question of subsetting, I have some Chinese characters but their Chinese font family is 115Mb so obviously I would want to subset it simply for size. Is Calibre editor the only way to subset a font in an EPUB? I couldn't see any Sigil plugins for this.

BetterRed · 03-26-2016, 06:31 PM

@bookman156 - try ==>FontShrinker - tool to subset a font

Calibre has a Polish Books feature that will subset fonts, it can also be used from the command line as well as the Library Manager

BR

DiapDealer · 03-26-2016, 06:45 PM

Toxaris has an ePubOptimizer Sigil plugin that will subset fonts, but I think it also optimizes images. I don't know if you can opt out of either process or not. It may be an all or nothing affair.

bookman156 · 03-26-2016, 06:54 PM

Thanks. I'll experiment with all these methods and see how it looks.

03-26-2016, 04:10 PM	#1
bookman156 Addict Posts: 368 Karma: 1000000 Join Date: Mar 2016 Device: none	What is the best way to change the embedded fonts? The EPUB I'm editing that I received from a publisher has embedded fonts. If I wanted to change these, is there a good way to do it in Sigil? I know I can unzip the EPUB and manually place the fonts in the font folder and change references in the CSS and wherever else, but is there a more automated way to do it in Sigil?

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03-26-2016, 04:15 PM	#2
theducks Well trained by Cats Posts: 30,967 Karma: 60358908 Join Date: Aug 2009 Location: The Central Coast of California Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A	You can use ADD EXISTING for Fonts as well as CSS, HTML, Images As you fiqured... Editing/adding @fonts will be necessary

03-26-2016, 04:19 PM	#3
DiapDealer Grand Sorcerer Posts: 28,511 Karma: 204127028 Join Date: Jan 2010 Device: Nexus 7, Kindle Fire HD	I don't know about automated per se, but yes, you should be able to do it a little bit easier from within Sigil. You can add new font files to your epub by using File->Add->Existing Files (or right clicking on a folder in Book View and selecting "Add Existing Files" from the context menu). You can then manually change the CSS font-face declarations to use your new font files and then delete the old fonts (right click on them in Book View). Saves you the trouble of unzipping/rezipping anyway.

03-26-2016, 04:25 PM	#6
bookman156 Addict Posts: 368 Karma: 1000000 Join Date: Mar 2016 Device: none	Excellent. Thank you both.

03-26-2016, 04:46 PM	#7
bookman156 Addict Posts: 368 Karma: 1000000 Join Date: Mar 2016 Device: none	While I'm on fonts, can I just check whether the 'Font Obfuscation' method chosen (currently I have none) is just for viewing in Sigil or whether it adds anything to the EPUB itself?

03-26-2016, 04:49 PM	#8
bookman156 Addict Posts: 368 Karma: 1000000 Join Date: Mar 2016 Device: none	I think I've misunderstood the term 'obfuscation' here. I was thinking something like how Photoshop sharpens fonts, but it is an entirely different matter altogether.

03-26-2016, 05:37 PM	#9
DiapDealer Grand Sorcerer Posts: 28,511 Karma: 204127028 Join Date: Jan 2010 Device: Nexus 7, Kindle Fire HD	Yes. Font obfuscation is a way of encrypting fonts so they're unusable should someone extract them from the epub and try to use them. It's not all that effective, but it may be required depending on the license you have to distribute a font (if a license is indeed required). You can right-click on a font-file in the Book Browser and quickly see if they have a form of obfuscation on them (no check mark beside either of the obfuscation methods means no obfuscation). Just remember that there can be no obfuscation on fonts in an epub you're going to convert to a Kindlebook with kindlegen/kindle-previewer.

03-26-2016, 06:18 PM	#12
bookman156 Addict Posts: 368 Karma: 1000000 Join Date: Mar 2016 Device: none	I see that Google now has all languages covered with free fonts: http://www.google.com/get/noto/ On the question of subsetting, I have some Chinese characters but their Chinese font family is 115Mb so obviously I would want to subset it simply for size. Is Calibre editor the only way to subset a font in an EPUB? I couldn't see any Sigil plugins for this.

03-26-2016, 06:31 PM	#13
BetterRed null operator (he/him) Posts: 21,681 Karma: 29711016 Join Date: Mar 2012 Location: Sydney Australia Device: none	@bookman156 - try ==>FontShrinker - tool to subset a font Calibre has a Polish Books feature that will subset fonts, it can also be used from the command line as well as the Library Manager BR

03-26-2016, 06:45 PM	#14
DiapDealer Grand Sorcerer Posts: 28,511 Karma: 204127028 Join Date: Jan 2010 Device: Nexus 7, Kindle Fire HD	Toxaris has an ePubOptimizer Sigil plugin that will subset fonts, but I think it also optimizes images. I don't know if you can opt out of either process or not. It may be an all or nothing affair.

03-26-2016, 06:54 PM	#15
bookman156 Addict Posts: 368 Karma: 1000000 Join Date: Mar 2016 Device: none	Thanks. I'll experiment with all these methods and see how it looks.

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