Fontlab TransType Pro 3.0.2 Manuel d'utilisateur télécharger pdf (Page 71)

Conversion Process

O p e n T y p e Fo nt s

Among the new features of TransType Pro is the support for the OpenType

font format. The OpenType font format, jointly developed by Microsoft and

Adobe, allows us to combine the best features of the TrueType and Type 1

font formats.

For the end user there is little difference between OpenType and TrueType

fonts: both are stored in a single font file, both are Unicode-encoded and

Windows and Mac OS directly support both.

From the inside, there are two possible forms of OpenType fonts: so-called

OpenType TT (or TrueType-flavored) and OpenType PS (or PostScript-

flavored).

The general structure of the font file is the same and both versions of the

format provide the same functionality. But there are some technical

differences:

Version OpenType TT OpenType PS

Outlines

-order, like in TrueType

fonts

-order, like in Type 1 fonts

Hinting

TrueType instructions Type 1 declarative hints

File

extension

TTF OTF

Comments

Basically any TrueType font

may be called an OpenType

TT font, but usually we call

them OpenType fonts only

when they have special

features.

Outline data is stored in CFF

(Compact Font Format) format

that is expected to work better

with PostScript devices.

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Fontlab TransType Pro 3.0.2 Manuel d'utilisateur Page 71