CHAPTER 4
274
Graphics
TABLE 4.22 Entries in a DeviceN process dictionary
KEY
TYPE
VALUE
ColorSpace
name or
array
(Required)
A name or array identifying the process color space, which may be any
device or CIE-based color space. If an
ICCBased
color space is specified, it must
provide calibration information appropriate for the process color components
specified in the
names
array of the
DeviceN
color space.
(Required)
An array of component names that correspond, in order, to the com-
ponents of the process color space specified in
ColorSpace
. For example, an RGB
color space must have three names corresponding to red, green, and blue. The
names may be arbitrary (that is, not the same as the standard names for the color
space components) and must match those specified in the
names
array of the
DeviceN
color space, even if all components are not present in the
names
array.
Components
array
TABLE 4.23 Entries in a DeviceN mixing hints dictionary
KEY
TYPE
VALUE
Solidities
dictionary
(Optional)
A dictionary specifying the solidity of inks to be used in blending
calculations when used as an alternative to the tint transformation function.
For each entry, the key is a colorant name, and the value is a number between
0.0 and 1.0. This dictionary need not contain entries for all colorants used in
this color space; it may also include additional colorants not used by this color
space.
A value of 1.0 simulates an ink that completely covers the inks beneath; a value
of 0.0 simulates a transparent ink that completely reveals the inks beneath. An
entry with a key of
Default
specifies a value to be used by all components in the
associated
DeviceN
color space for which a solidity value is not explicitly pro-
vided. If
Default
is not present, the default value for unspecified colorants is
0.0; applications may choose to use other values.
If this entry is present,
PrintingOrder
must also be present.
PrintingOrder
array
(Required if
Solidities
is present)
An array of colorant names, specifying the or-
der in which inks are laid down. Each component in the
names
array of the
DeviceN
color space must appear in this array (although the order is unrelated
to the order specified in the
names
array). This entry may also list colorants
unused by this specific
DeviceN
instance.