Bug in the editor error checker.

JSWolf · 02-15-2025, 11:57 AM

calibre 7.26 here.

I have an eBook that has emebedded fonts. Two of the fonts are named Montserrat and one is named Monserrat Medium.

The error checker says to change the name to Monserrat medium for all of the fonts. I allow the error to be fixed. Then I run the error checker again and It's now asking for all fonts to be named Monserrat.

The two screen grabs show the the problem.

Click image for larger version

Name: Monserrat.jpg
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Click image for larger version

Name: Monserrat Medium.jpg
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ID: 213689

If I change the names to Monserrat and then manually change one of the fonts to "Monserrat Medium" then I no longer get an error.

Click image for larger version

Name: Monserrat Fixed.jpg
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Size: 245.8 KB
ID: 213691

fogice · 02-15-2025, 03:16 PM

I have seen this error as well.

JSWolf · 02-15-2025, 03:26 PM

Quote:

Originally Posted by fogice

I have seen this error as well.

I hope it can be fixed for the next release.

Karellen · 02-15-2025, 04:15 PM

I have seen this error a few times also. Sometimes it is a circular error and never fixes itself.
It has been quite a while since I last encountered it, so don't have a current example I can provide.

JSWolf · 02-15-2025, 04:51 PM

Quote:

Originally Posted by Karellen

I have seen this error a few times also. Sometimes it is a circular error and never fixes itself.
It has been quite a while since I last encountered it, so don't have a current example I can provide.

Mine is a current example.

kovidgoyal · 02-15-2025, 10:18 PM

open a bug report and attach an epub reproducing the bug.

Jaws · 02-16-2025, 03:26 PM

When you say "two of the fonts are names Montserrat, and one of them is named Montserrat[sic] Medium", is there any other distinguishing part of either of the fonts named "Montserrat" (is one of them "italic" and one of them "bold" or "semibold")? If not, the problem might be the actual embedded font files more than the error checker.

Unfortunately, some software (I've seen it primarily in the cloud-heaviest Adobe stuff), when embedding fonts, doesn't do a very good job of ensuring that the fonts being embedded have unique names, both of the files and internally... especially for fonts not originating in that software-vendor's ecosystem. For example, if one used the full ITC Galliard set when doing the original layout for print and then used the internal converter to create an epub or PDF, the font names all compress down to "ITC Galliard"... even though there are sixteen variants. (This can be a big problem trying to route large technical documents to overseas printers as PDFs or even raw PostScript.)

And if the document crossed the streams — moved between Apple and any other OS — font integrity gets even more fun. That's not Calibre's error checker...

JSWolf · 02-17-2025, 08:37 AM

It is a problem with the error checker. There's no way it cannot be.

JSWolf · 02-17-2025, 09:00 AM

Quote:

Originally Posted by kovidgoyal

open a bug report and attach an epub reproducing the bug.

https://bugs.launchpad.net/calibre/+bug/2098671

PeterT · 02-17-2025, 09:05 AM

Did you mean to make that download publicly available?

Sent from my Pixel 7a using Tapatalk

DNSB · 02-17-2025, 06:05 PM

Sorry, Jon but I downloaded the book you linked to the bug report and it does not show the bug when I open it in calibre's editor. It does have only one font with Medium in the font name.

Perhaps you could download a fresh copy from the store and attach that to a private bug report?

Karellen · 02-17-2025, 06:13 PM

Hmm, I downloaded it also and there are 3 font files.

There are no errors for CheckBook.
There are no EpubCheck error reports for the fonts. There is an error for not declaring svg in the opf for the cover page.

Is this the version of epubcheck you are using...

EPUBCheck v5.2.1
Validating using EPUB version 3.3 rules.
No errors or warnings detected.
Messages: 0 fatals / 0 errors / 0 warnings / 0 infos

EPUBCheck completed

DNSB · 02-17-2025, 06:19 PM

Since the book was in Kobo Plus, I picked it up to have an original to look at.

calibre's e-book editor gave multiple errors. I've added images of the ones related to the fonts. The @font-face entries all refer to Montserrat while one of the fonts internal name is Montserrat Medium. This appears to be your original error and is an error in the ebook not in the error checker. If I edited the font weight 500 entry to "Montserrat Medium", that error went away. Some of the other errors reported such as font/ttf being an error are indeed errors in the error checker since ePub3 allows that media-type for TTF fonts.

02-15-2025, 11:57 AM	#1
JSWolf Resident Curmudgeon Posts: 78,433 Karma: 142887248 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3	Bug in the editor error checker. calibre 7.26 here. I have an eBook that has emebedded fonts. Two of the fonts are named Montserrat and one is named Monserrat Medium. The error checker says to change the name to Monserrat medium for all of the fonts. I allow the error to be fixed. Then I run the error checker again and It's now asking for all fonts to be named Monserrat. The two screen grabs show the the problem. If I change the names to Monserrat and then manually change one of the fonts to "Monserrat Medium" then I no longer get an error.

02-17-2025, 06:19 PM	#13
DNSB Bibliophagist Posts: 43,418 Karma: 165170834 Join Date: Jul 2010 Location: Vancouver Device: Kobo Sage, Libra Colour, Lenovo M8 FHD, Paperwhite 4, Tolino epos	Since the book was in Kobo Plus, I picked it up to have an original to look at. calibre's e-book editor gave multiple errors. I've added images of the ones related to the fonts. The @font-face entries all refer to Montserrat while one of the fonts internal name is Montserrat Medium. This appears to be your original error and is an error in the ebook not in the error checker. If I edited the font weight 500 entry to "Montserrat Medium", that error went away. Some of the other errors reported such as font/ttf being an error are indeed errors in the error checker since ePub3 allows that media-type for TTF fonts. Attached Thumbnails

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02-15-2025, 03:16 PM	#2
fogice Addict Posts: 218 Karma: 12092 Join Date: May 2014 Device: Kobo Libra 2	I have seen this error as well.

02-15-2025, 04:15 PM	#4
Karellen Wizard Posts: 1,547 Karma: 9250682 Join Date: Sep 2021 Location: Australia Device: Kobo Libra 2	I have seen this error a few times also. Sometimes it is a circular error and never fixes itself. It has been quite a while since I last encountered it, so don't have a current example I can provide.

02-15-2025, 10:18 PM	#6
kovidgoyal creator of calibre Posts: 44,986 Karma: 27109258 Join Date: Oct 2006 Location: Mumbai, India Device: Various	open a bug report and attach an epub reproducing the bug.

02-16-2025, 03:26 PM	#7
Jaws JCL Punch-Card Collector Posts: 70 Karma: 34468 Join Date: Jun 2014 Location: Antarctica Device: Aggressively Device Independent	When you say "two of the fonts are names Montserrat, and one of them is named Montserrat[sic] Medium", is there any other distinguishing part of either of the fonts named "Montserrat" (is one of them "italic" and one of them "bold" or "semibold")? If not, the problem might be the actual embedded font files more than the error checker. Unfortunately, some software (I've seen it primarily in the cloud-heaviest Adobe stuff), when embedding fonts, doesn't do a very good job of ensuring that the fonts being embedded have unique names, both of the files and internally... especially for fonts not originating in that software-vendor's ecosystem. For example, if one used the full ITC Galliard set when doing the original layout for print and then used the internal converter to create an epub or PDF, the font names all compress down to "ITC Galliard"... even though there are sixteen variants. (This can be a big problem trying to route large technical documents to overseas printers as PDFs or even raw PostScript.) And if the document crossed the streams — moved between Apple and any other OS — font integrity gets even more fun. That's not Calibre's error checker...

02-17-2025, 08:37 AM	#8
JSWolf Resident Curmudgeon Posts: 78,433 Karma: 142887248 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3	It is a problem with the error checker. There's no way it cannot be.

02-17-2025, 09:05 AM	#10
PeterT Grand Sorcerer Posts: 13,134 Karma: 78857258 Join Date: Nov 2007 Location: Toronto Device: Libra H2O, Libra Colour	Did you mean to make that download publicly available? Sent from my Pixel 7a using Tapatalk

02-17-2025, 06:05 PM	#11
DNSB Bibliophagist Posts: 43,418 Karma: 165170834 Join Date: Jul 2010 Location: Vancouver Device: Kobo Sage, Libra Colour, Lenovo M8 FHD, Paperwhite 4, Tolino epos	Sorry, Jon but I downloaded the book you linked to the bug report and it does not show the bug when I open it in calibre's editor. It does have only one font with Medium in the font name. Perhaps you could download a fresh copy from the store and attach that to a private bug report?

02-17-2025, 06:13 PM	#12
Karellen Wizard Posts: 1,547 Karma: 9250682 Join Date: Sep 2021 Location: Australia Device: Kobo Libra 2	Hmm, I downloaded it also and there are 3 font files. There are no errors for CheckBook. There are no EpubCheck error reports for the fonts. There is an error for not declaring svg in the opf for the cover page. Is this the version of epubcheck you are using... EPUBCheck v5.2.1 Validating using EPUB version 3.3 rules. No errors or warnings detected. Messages: 0 fatals / 0 errors / 0 warnings / 0 infos EPUBCheck completed