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Re: [ft-devel] Understanding Type1 fonts

From: mpsuzuki
Subject: Re: [ft-devel] Understanding Type1 fonts
Date: Wed, 9 Jan 2008 18:25:13 +0900


On Wed, 9 Jan 2008 17:11:00 +0800
"Dmitry Timoshkov" <address@hidden> wrote:
><address@hidden> wrote:
>> However, it is theoretically possible for AFM & PFM
>> to have the metrics which is different from PFA & PFB.
>> I don't know recent utilization is popular.
>AFM and PFM files also may contain kerning data which is not
>available in .pfa/.pfb files.

Oops, great thank you for pointing out pair kerning
by AFM/PFM I've overlooked! I had to refer PostScript
Language Reference Manual p. 333. It tells that a font
object in PostScript space has no (explict) entry to
store kerning info:

>Glyph metric information is also available separately
>in the form of Adobe font metrics (AFM) and Adobe
>composite font metrics (ACFM) files. These files are
>for use by application programs that generate PostScript
>page descriptions and must make formatting decisions
>based on the widths and other metrics of glyphs.

>Kerning information is also available in the AFM and
>ACFM files. When possible, applications should use
>this information directly instead of generating PostScript
>instructions to compute it.


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