[Devel] Re: Kerning at small sizes

[Werner LEMBERG]

> I've had the time to try out a couple of strategies for reducing the
> kerning at small ppem sizes to compensate for the effects of
> hinting, now.

Thanks for testing.

> 1) Don't kern below x ppem.
>
> 2) Reduce kerning values by some amount depending on x.
>
> 3) Scale kerning values by some factor depending on x.
>
>   The idea here is to multiply the kerning values by some function of
> the ppem value. I used simply:
>
>     x/25
>
> for x < 25.
>
>   To be honest, (2) & (3) gave remarkably similar results, but what
> few differences there were seemed to favour (3) and it's simpler, so
> I think that's the front-runner. I've spent some time looking at 10
> different kerning pairs for sizes from 10ppem upward to try and find
> the best magic number and I think 25 was the best compromise.

Added to the CVS.

Folks, please try that!  It is quite important to check whether the
used kerning values are still too aggressive for some fonts (this is,
whether kerning produces too close character pairs).


    Werner