CHAPTER 5
400
Text
5.2.3 Horizontal Scaling
The horizontal scaling parameter,
T
h
, adjusts the width of glyphs by stretching or
compressing them in the horizontal direction. Its value is specified as a percent-
age of the normal width of the glyphs, with 100 being the normal width. The scal-
ing always applies to the horizontal coordinate in text space, independently of the
writing mode. It affects both the glyph’s shape and its horizontal displacement
(that is, its displacement vector). If the writing mode is horizontal, it also affects
the spacing parameters
T
c
and
T
w
, as well as any positioning adjustments per-
formed by the
TJ
operator. Figure 5.8 shows the effect of horizontal scaling.
T
h
= 100 (default)
T
h
= 50
Word
WordWord
FIGURE 5.8
Horizontal scaling
5.2.4 Leading
The leading parameter,
T
l
, is measured in unscaled text space units . It specifies
the vertical distance between the baselines of adjacent lines of text, as shown in
This is 12-point text with
14.5-point leading
Leading
FIGURE 5.9
Leading
The leading parameter is used by the
TD
,
T*
,
'
, and
"
operators; see Table 5.5 on
the vertical coordinate in text space, independently of the writing mode.