CHAPTER 4
222
Graphics
KEY
TYPE
DESCRIPTION
TR
function, array, or
name
(Optional)
The transfer function, which maps the interval [ 0.0 1.0 ] to the in-
terval [ 0.0 1.0 ] (see Section 6.3, “Transfer Functions”). The value is either a
single function (which applies to all process colorants) or an array of four
functions (which apply to the process colorants individually). The name
Identity
may be used to represent the identity function.
(Optional; PDF 1.3)
Same as
TR
except that the value may also be the name
Default
, denoting the transfer function that was in effect at the start of the
page. If both
TR
and
TR2
are present in the same graphics state parameter dic-
tionary,
TR2
takes precedence.
(Optional)
The halftone dictionary or stream (see Section 6.4, “Halftones”) or
the name
Default
, denoting the halftone that was in effect at the start of the
page.
(Optional; PDF 1.3)
The flatness tolerance (see Section 6.5.1, “Flatness Toler-
(Optional; PDF 1.3)
The smoothness tolerance (see Section 6.5.2, “Smooth-
(Optional)
A flag specifying whether to apply automatic stroke adjustment
(see Section 6.5.4, “Automatic Stroke Adjustment”).
(Optional; PDF 1.4)
The current blend mode to be used in the transparent
imaging model (see Sections 7.2.4, “Blend Mode,” and 7.5.2, “Specifying
(Optional; PDF 1.4)
The current soft mask, specifying the mask shape or
mask opacity values to be used in the transparent imaging model (see
Note:
Although the current soft mask is sometimes referred to as a “soft clip,”
altering it with the
gs
operator completely replaces the old value with the new
one, rather than intersecting the two as is done with the current clipping path
parameter (see Section 4.4.3, “Clipping Path Operators”).
TR2
function, array, or
name
HT
dictionary, stream,
or name
number
number
boolean
name or array
FL
SM
SA
BM
SMask
dictionary or name
CA
number
(Optional; PDF 1.4)
The current stroking alpha constant, specifying the con-
stant shape or constant opacity value to be used for stroking operations in the
transparent imaging model (see “Source Shape and Opacity” on page 526 and
(Optional; PDF 1.4)
Same as
CA
, but for nonstroking operations.
ca
number