Why can't ePub font be bold? - Page 2

PointingMonkey · 07-01-2021, 09:03 AM

Something worth trying is embedding the fonts into the epub file. I recently made an epub which had italic words using <i></i> tags. When I opened the epub in Adobe Digital Editions (God how I hate ADE, all hail Calibre) without the embedded fonts it ignore the italic tags and the words appeared in regular font. After embedding the fonts ADE read the italic tags perfectly.

I'm not sure on this, but my problem at the very least seemed to be down to ADE's really wonky support for tags within epub2 files (small caps also aren't supported). Yet when I converted to epub3, even without embedding fonts it worked fine.

DiapDealer · 07-01-2021, 01:43 PM

Without the full picture, it's pretty-hard to diagnose. But my guess is that fonts are already embedded, and that no bold @font-face is declared anywhere. All the attempts to bolden an embedded glyph that has no bold font-face in the included family will fail. Unless a capable fallback font is declared when the font-family is assigned to elements via css. There is more than likely a second stylesheet that handles the font embedding.

DNSB · 07-01-2021, 07:46 PM

Given that the epub stylesheet looks like a calibre conversion, the font embedding is likely to be found in page-styles.css.

Jellby · 07-02-2021, 02:55 AM

Quote:

Originally Posted by DiapDealer

and that no bold @font-face is declared anywhere.

Or worse, a bold @font-face is declared, but with a font file that's not bold. So the renderer believes it's using a bold face, but the user doesn't see it any bolder.

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07-01-2021, 09:03 AM	#16
PointingMonkey Member Posts: 23 Karma: 30536 Join Date: Apr 2021 Device: none	Something worth trying is embedding the fonts into the epub file. I recently made an epub which had italic words using <i></i> tags. When I opened the epub in Adobe Digital Editions (God how I hate ADE, all hail Calibre) without the embedded fonts it ignore the italic tags and the words appeared in regular font. After embedding the fonts ADE read the italic tags perfectly. I'm not sure on this, but my problem at the very least seemed to be down to ADE's really wonky support for tags within epub2 files (small caps also aren't supported). Yet when I converted to epub3, even without embedding fonts it worked fine.

07-01-2021, 01:43 PM	#17
DiapDealer Grand Sorcerer Posts: 28,607 Karma: 204624552 Join Date: Jan 2010 Device: Nexus 7, Kindle Fire HD	Without the full picture, it's pretty-hard to diagnose. But my guess is that fonts are already embedded, and that no bold @font-face is declared anywhere. All the attempts to bolden an embedded glyph that has no bold font-face in the included family will fail. Unless a capable fallback font is declared when the font-family is assigned to elements via css. There is more than likely a second stylesheet that handles the font embedding.

07-01-2021, 07:46 PM	#18
DNSB Bibliophagist Posts: 46,377 Karma: 169098492 Join Date: Jul 2010 Location: Vancouver Device: Kobo Sage, Libra Colour, Lenovo M8 FHD, Paperwhite 4, Tolino epos	Given that the epub stylesheet looks like a calibre conversion, the font embedding is likely to be found in page-styles.css.

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