When to use what font variation (extralight, semilight, semibold, extrabold...)?

pers0n's picture

I've seen fonts use these kinds of variations:

and I was curious when to use which. Now I've seen someone say to use SemiBold when using white on a black background. And of course I know to use Bold when trying to emphasize something or Light if its something that needs to be airy, of if the font-size is really huge, and perhaps Black if its something that really needs to stand out.

Also I was curious about the number sizes I've seen also:
100 = ExtraLight
900 = Black

Does 500 = regular?

Theunis de Jong's picture

Semibold on reversed background: this is because of human perception. A regular font in reverse looks lighter than when viewed "normally". There is at least one font that comes with 'normal' and 'reverse' versions, where the to-be-used-in-reverse version is ever so slightly more bold than the regular variant. (Oh, brain! Come on! (thump, thump)... nope.)

As to when to use what variant ... Whenever you like, I'd say. I can set a book title extra black and very small, or large and light ... or exactly the opposite. Whatever looks best. Period. (Generally speaking, a small bold title with a large black subtitle does not look good.)

I think the numbering scheme was designed to work around made-up weight names -- i.e., "Semibold" or "Demibold"? "Regular" or "Medium" or "Book"? MS Windows pretends to use the numbered Weight for selecting an appropriate font, but actually it doesn't -- I always got Regular for a value around 500-ish and lower, and Bold for anything higher, and never a Light or Semibold or Black font. Mind, that's pre-Windows 7 -- word on the street is WPF has a better "fitting" algorithm, but I haven't used that as yet.

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