f-ligatures are uneven - Githubissues

huertatipografica / Andada-Pro

Andada is a text font with an organic-slab serif, hybrid style, a solid design of medium stroke contrast.

SIL Open Font License 1.1

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f-ligatures are uneven #20

Closed ortoslon closed 3 years ago

ortoslon commented 3 years ago

Problems with "f" in ligatures at some sizes:

the crossbar is thinner than in the unligated "f"
the joining stroke is slightly below or above the top serif in "i"/"l"
the bottom serif is off the baseline

https://github.com/huertatipografica/Andada-Pro/blob/129785ebf91d19507bb77f321d20c0c3114cbea5/fonts/ttf/AndadaPro-Regular.ttf and https://github.com/huertatipografica/Andada-Pro/blob/129785ebf91d19507bb77f321d20c0c3114cbea5/fonts/ttf/AndadaPro-Medium.ttf in Chrome 90 on Win10:

ortoslon commented 3 years ago

Reproducing after https://github.com/huertatipografica/Andada-Pro/commit/9caa99c2e30d909462111a0125a72ac0f5fd6ee8:

CaroGiovagnoli commented 3 years ago

Screenshot 2021-05-25 at 13 36 06 copy Screenshot 2021-05-25 at 13 35 47 copy

ortoslon commented 3 years ago

@CaroGiovagnoli, those screenshots have fonts scaled 2x, so 18 px = 36 ppem in terms of physical pixels. My screenshots aren't scaled (px = ppem).

Reproducing in https://github.com/huertatipografica/Andada-Pro/blob/9e59cad496923851384fcd47c55d82dea9f186a3/fonts/ttf/AndadaPro-Regular.ttf and https://github.com/huertatipografica/Andada-Pro/blob/9e59cad496923851384fcd47c55d82dea9f186a3/fonts/ttf/AndadaPro-Medium.ttf. Added 36 px = 36 ppem for comparison; it doesn't show problems.

CaroGiovagnoli commented 3 years ago

Which OS and version are you using? Windows?

ortoslon commented 3 years ago

Chrome on Windows 10, as I wrote in the first comment.

This seems to be independent of Chrome (maybe dependent on Truetype hinting). Here's the old version of Andada Pro Medium 21 pt = 28 ppem in Notepad on Windows 10. I'll check the new version in a minute.

I don't have Word/Powerpoint nearby to check in them, sorry.

ortoslon commented 3 years ago

Yes, looks fixed after https://github.com/huertatipografica/Andada-Pro/commit/bc76db05bb47a098058e442ac9c43c24b1ee7974. The "fl" join seems lighter at some sizes, but this might be inevitable with autohinting.

CaroGiovagnoli commented 3 years ago

The problems are:

fl in 18x 17x 14x 13x split up
fi 27x to 23x have an extra black pixel on the i

(The font is too curvy to be really autohinting friendly)

regular-medium

ortoslon commented 3 years ago

@CaroGiovagnoli, I've just noticed that the ligated "ff" still has similar problems. https://github.com/huertatipografica/Andada-Pro/blob/bc76db05bb47a098058e442ac9c43c24b1ee7974/fonts/ttf/AndadaPro-Medium.ttf:

CaroGiovagnoli commented 3 years ago

medium regular

It was an issue with the superposition of the horizontal stem.

ortoslon commented 3 years ago

Bottom serifs are still off the baseline:

CaroGiovagnoli commented 3 years ago

![U regular2 ploading medium2.jpg…]()

ortoslon commented 3 years ago

Reproducing in https://github.com/huertatipografica/Andada-Pro/blob/4c06785c2b890c7dff6a909e05c4a0a3283a25b0/fonts/ttf/AndadaPro-Medium.ttf:

CaroGiovagnoli commented 3 years ago

The serif and stem have little curvy details, therefore there are some sizes that aren't autohinting friendly.