Middle- & Final Delta suppose to stop working after 56 PPM?

-Rudy-'s picture

Is it normal that the Middle- and Final Delta intructions in FontLab stop working after 56 PPM? Am I experiencing somekind of bug? ...or am I just out of delta?

John Hudson's picture

I believe this is 'by design', i.e. not a bug per se. It isn't a limitation of the TT instruction set, but seems to be a limitation of FontLab's implementation. Hopefully Adam Twardoch will drop by and shed some light on this.

twardoch's picture

Yes, I think the internal TrueType instructions compiler used in FontLab Studio has some limitation of the top range at which deltas are applied.

Cheers,
Adam

-Rudy-'s picture

There is no way around this? No additional or other software I can use to tweak this?

Rudy

John Hudson's picture

Not in FontLab and not that will respect your FontLab-created hints.

VTT provides much more advanced TT hinting capability, but you'll need to start hinting from scratch in VTT.

gferreira's picture

i wonder why you need a delta hint at 56ppem.

as far as i know, delta hints are a 'last resort' when trying to gridfit a glyph. i have only used them for much lower ppem values (<13).

-Rudy-'s picture

i wonder why you need a delta hint at 56ppem

Minor details that can't be corrected with "normal" hinting. Minor errors that I will probably only look at and see, or an expert who examins my typeface...

I think I'll look into VTT hinting when I make my next typeface.

Rudy

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