Font-weight property not working below 400

[taisdls]

Hi, I never posted here and english is not my mother language so sorry for any errors.. I'm trying to solve a mystery here.

My css looks like this:

@font-face {
font-family:"CantoriaMTSTd";
font-style:normal;
font-weight:normal;
src : url("../font/CantoriaMTSTd.otf");
}
@font-face {
font-family:"CantoriaMTSTd";
font-style:normal;
font-weight:300;
src : url("../font/CantoriaMTStd-Light.otf");
}
@font-face {
font-family:"CantoriaMTSTd";
font-style:normal;
font-weight:bold;
src : url("../font/CantoriaMTStd-Bold.otf");
}
p.sum1 {
-epub-hyphens:none;
font-family:"CantoriaMTSTd", serif;
font-size:1em;
font-style:normal;
font-weight:normal;
text-align:left;
}
p.sum2 {
-epub-hyphens:none;
font-family:"CantoriaMTSTd", serif;
font-size:1em;
font-style:normal;
font-weight:bold;
line-height:1.25;
text-align:left;
}
p.sum3 {
-epub-hyphens:none;
font-family:"CantoriaMTSTd", serif;
font-size:1em;
font-style:normal;
font-weight:300;
line-height:1.25;
text-align:left;
}


and my html file looks like this:

<p class="sum1">O pintor das transformações de sua gente —<br/> Gustavo Henrique Tuna</p>
<p class="sum2">CONTOS</p>
<p class="sum2">Urupês</p>
<p class="sum3">O engraçado arrependido</p>

All font files are properly inserted into the epub, and I checked that the filenames are correct in the css. I also checked for overlaps in the css and found none.
All weight and style variables in this font work, except the font-weight:300.
Sigil and all readers I've tried are reading the font as font-weight: normal. The font works normally in indesign and other softwares.
I also tried to change de font file multiple times.

Does somebody please know what's going on?

[JSWolf]

It's most likely something to do with QT. Also, in a lot of reading software numeric weights don't work.

If this eBooks is going to be read on an eInk screen, the light font is not going to look good as it's too light.

[Hitch]

Have you tried renaming the Light font to something like Light, (e.g., CantoriaMTSTd_lt) to see if that takes, instead of trying to call the 300 weight?

Hitch

[taisdls]

Originally Posted by JSWolf

It's most likely something to do with QT. Also, in a lot of reading software numeric weights don't work.

Thank you for answering! In the same file I use numeric weight for the semibold property (600) and it does work on Sigil and the other softwares I tried. I know that it won't work everywhere but I'm curious to why just the 300 property doesn't work.

I don't know what QT is, could you tell me what the acronym means so I can search it?

[taisdls]

Originally Posted by Hitch

Have you tried renaming the Light font to something like Light, (e.g., CantoriaMTSTd_lt) to see if that takes, instead of trying to call the 300 weight?

Hitch

Yes, I tried that. I even tried to exclude the file and the references to the file of the normal font, but Sigil reads it like normal anyway. Thank you for responding.

[Hitch]

Originally Posted by taisdls

Yes, I tried that. I even tried to exclude the file and the references to the file of the normal font, but Sigil reads it like normal anyway. Thank you for responding.

Then my next question would be, have you closely examined the metadata on the font faces? Do all the faces allow embedding? (Yes, I know, it seems daft that one mightn't, but I've seen stranger.)

Is this a free download of a foundry font? When i view Cantoria MT at the typical foundry sites, I don't see any "weights" like 300. I see light, Std. Light, Extra Bold, Bold and the usual. I don't see 400 or 300 weight anywhere. I further don't have this particular font in my foundry, so I can't look at the meta, but...so far, even in searching online, I don't see a Cantoria 300. ???

Hitch

[JSWolf]

Originally Posted by taisdls

I don't know what QT is, could you tell me what the acronym means so I can search it?

Qt is the underlying software that allows Sigil to work on Windows, Linux, and Mac. It has some gotchas with it and this could be one of them.

[Turtle91]

QT stands for 'QT' it is a programming development environment. I would say a large percentage of apps and programs use it... but... it does have some bugs. Wolfie was just saying it might be a QT bug.

[DiapDealer]

Sigil's WebEngine rendering system is not entirely definitive for how things will look on various devices and reading apps. Have you tried previewing it on actual reading devices and in Epub apps to make sure it's not working?

EDIT: whoops. I missed the "and all readers I've tried" part.

[taisdls]

Originally Posted by JSWolf

QT is QuickTime which is the underlying software that allows Sigil to work on Windows, Linux, and Mac. It has some gotchas with it and this could be one of them.

Thank you for explaining. I will just use the normal font. I actually would prefer to do that from the start, but my employer does not understand well the differences between print and epub material, and asks that the exact same specifications be kept. I asked because I'm curious and also to be able to explain to him why I didn't keep the weight of the fonts as he wanted. Anyway, thank you.

[taisdls]

Originally Posted by Hitch

Then my next question would be, have you closely examined the metadata on the font faces? Do all the faces allow embedding? (Yes, I know, it seems daft that one mightn't, but I've seen stranger.)

Is this a free download of a foundry font? When i view Cantoria MT at the typical foundry sites, I don't see any "weights" like 300. I see light, Std. Light, Extra Bold, Bold and the usual. I don't see 400 or 300 weight anywhere. I further don't have this particular font in my foundry, so I can't look at the meta, but...so far, even in searching online, I don't see a Cantoria 300. ???

Hitch

I'm not an expert on this particular area, unfortunately, so I wouldn't know how to examine the metadata on the font faces. And I'm using the fonts my workplace provides, so I don't know the license status either..
I'm using the light font, not an especified 300 weight font, but the font-weight property:300 usually equals light, right?

[taisdls]

Originally Posted by Turtle91

QT stands for 'QT' it is a programming development environment. I would say a large percentage of apps and programs use it... but... it does have some bugs. Wolfie was just saying it might be a QT bug.

Oh, I see. I'm really not a programmer, just an editorial designer with excessive curiosity, lol. So that was another level for me. Thanks

[Hitch]

Originally Posted by taisdls

I'm not an expert on this particular area, unfortunately, so I wouldn't know how to examine the metadata on the font faces. And I'm using the fonts my workplace provides, so I don't know the license status either..
I'm using the light font, not an especified 300 weight font, but the font-weight property:300 usually equals light, right?

So, you're calling it a weight that it, itself, does not designate itself? You're just assigning "300" to mean light? What if the actual weight is (say) 350 or 400 or...whatever? You could be giving it conflicting instructions, which is why the font is crashing.

Although, then you say that you've removed the "300" designation, probably named it Light (or whatever) and it still doesn't work?

Without seeing the fonts, which appear to not exist in the wild, (those faces for that font, I mean), I'm not sure if we can solve that from here.

Nothing you have done has made the Light face work? In any environment, or only this one?

Hitch

[DiapDealer]

My question would be whether the correct font is rendering at all (never mind the weight) when the light font is requested. If not, it could be a case where the font itself won't embed.

[JSWolf]

A light font may work in print, but it doesn't work in an eBook as it's too light (not enough weight).

When you do make this eBook, test it on eInk devices such as Kobo and Kindle. That way you can see for yourself how bad a light font is for an eBook.