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                                                342
           CHAPTER 4                                                                   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
                                Images” on page 553) encoded with image samples should be used:
                                   0    If present, encoded soft-mask image information should be ig-
                                        nored.
                                   1    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.
                                   2    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.
                                If this entry has a nonzero value, SMask should not be specified. See also
                                Section 3.3.8, “JPXDecode Filter.”
                                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
                                implementation note 53 in Appendix H.)

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
                                Elements from Content Items” on page 868).

ID                byte string   (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
                                Attributes Related to Web Capture”).

OPI               dictionary    (Optional; PDF 1.2) An OPI version dictionary for the image (see Section
                                10.10.6, “Open Prepress Interface (OPI)”). If ImageMask is true, this entry
                                is ignored.

Metadata          stream        (Optional; PDF 1.4) A metadata stream containing metadata for the image
                                (see Section 10.2.2, “Metadata Streams”).

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