[Ghitulescu]

I see that Calibre displays (in preview but also in the standalone, that module that launches when one clicks upon the epub format in the library) the book as if all variants of the font exist (it makes it bold or italic, although only the regular version exists).

Both ADE on computer as the ones used in Sony T series (I have them all three), do not create fake bold/italics. I do not have other ereaders, if one disregards the very basic Trekstor Pyrus Mini.

The fonts are TTF.

I understand that OTF may have some hints/pointers/info helping the viewer display also other shapes (this is how variable width works).

Is calibre doing a service, or there is some "unlocking" magic commands?

Thanks