CHAPTER 4
342
Graphics
KEY
TYPE
VALUE
SMaskInData
integer
(Optional for images that use the
JPXDecode
filter, meaningless otherwise;
PDF 1.5)
A code specifying how soft-mask information (see “Soft-Mask
0
1
If present, encoded soft-mask image information should be ig-
nored.
The image’s data stream includes encoded soft-mask values. An
application can create a soft-mask image from the information to
be used as a source of mask shape or mask opacity in the transpar-
ency imaging model.
The image’s data stream includes color channels that have been
preblended with a background; the image data also includes an
opacity channel. An application can create a soft-mask image with
a
Matte
entry from the opacity channel information to be used as
a source of mask shape or mask opacity in the transparency mod-
el.
2
If this entry has a nonzero value,
SMask
should not be specified. See also
Default value: 0.
Name
name
(Required in PDF 1.0; optional otherwise)
The name by which this image
XObject is referenced in the
XObject
subdictionary of the current resource
dictionary (see Section 3.7.2, “Resource Dictionaries”).
Note:
This entry is obsolescent and its use is no longer recommended. (See
StructParent
integer
(Required if the image is a structural content item; PDF 1.3)
The integer key
of the image’s entry in the structural parent tree (see “Finding Structure
(Optional; PDF 1.3; indirect reference preferred)
The digital identifier of
the image’s parent Web Capture content set (see Section 10.9.5, “Object
(Optional; PDF 1.2)
An OPI version dictionary for the image (see Section
ImageMask
is
true
, this entry
is ignored.
(Optional; PDF 1.4)
A
metadata stream
containing metadata for the image
(see Section 10.2.2, “Metadata Streams”).
ID
byte string
OPI
dictionary
Metadata
stream