Re: [Fontforge-users] Adjusting height of font

[Drew G. <dot...@gm...>]

Thanks, I will give it a shot!

BTW If I understand correctly (not necessarily a safe bet), I think
that IM uses Ghostscript to render text...

drew

On 14 Sep 2005 11:49:09 -0700, George Williams <gw...@si...> wrote:
> On Tue, 2005-09-13 at 10:27, Drew Gilmore wrote:
> > There's a particular font ("Cosmos") I need to use with ImageMagick.
> > Problem is that the tops of the dots on the lower case i and j
> > characters rise above the top of all the capital letters. (Sorry I
> > don't know all the font metric terminology yet...)
> >
> > When ImageMagick renders those two characters, it shaves off the top
> > of the dots! I'm wondering if there's a quick way to alter the font in
> > FontForge - say, by raising the height of the font - so that this
> > doesn't happen.
> Hmm. I don't know what image magick uses to display fonts.
>=20
> My first impression is that it is unlikely the font itself contains a
> bad clipping rectangle, but if it does you can adjust it with fontforge.
> Unfortunately there are two fields that may need to be modified (one for
> windows, one for the mac, and god knows which linux will pick).
>=20
> You need a version of fontforge at least as recent as 4-Sept-2005 (the
> current distribution will do) to set both:
>         Element->Font Info->OS/2->Metrics
>                 Set Win Ascent Offset to a number >=3D0 and set the
>                 checkbox [*] Is Offset.
>                 Do the same for HHead Ascent Offset
>=20
> Another possibility is that ImageMagick incorrectly clips all fonts to
> some standard ascent/descent it has built in to it.
> There are various things you could try to fix this:
>         1) Change the font's Typo Ascent Offset (same dlg) to be bigger
>         2) Displace the font downwards so that we lie about the baseline
>                 and it has a larger effective ascent
>                 Edit->Select->Select All
>                 Element->Transforms->Transform
>                  Select Move
>                  Set Y to be a negative number (maybe -100? maybe more)
>         3) Make the font's glyphs take up a smaller portion of the
>                 em-square
>                 Edit->Select->Select All
>                 Element->Transforms->Transform
>                  Select Scale Uniformly
>                  Set the percentage to ?90%?
>=20
> (I can't give good values for the Transform dlg, because they will
> depend on the font in question).
>=20
> I don't really have very high hopes that any of these will actually
> work, because I can only guess at what is causing the problem.
>=20
>