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                                                        968
            CHAPTER 10                                                         Document Interchange



            The visual presentation of a printer’s mark is defined by a form XObject specified
            as an appearance stream in the N (normal) entry of the printer’s mark annota-
            tion’s appearance dictionary (see Section 8.4.4, “Appearance Streams”). More
            than one appearance may be defined for the same printer’s mark to meet the
            requirements of different regions or production facilities. In this case, the
            appearance dictionary’s N entry holds a subdictionary containing the alternate
            appearances, each identified by an arbitrary key. The AS (appearance state) entry
            in the annotation dictionary designates one of them to be displayed or printed.

            Note: The printer’s mark annotation’s appearance dictionary may include R (roll-
            over) or D (down) entries, but appearances defined in either of these entries are
            never displayed or printed.

            Like all annotations, a printer’s mark annotation is defined by an annotation dic-
            tionary (see Section 8.4.1, “Annotation Dictionaries”); its annotation type is
            PrinterMark. The AP (appearances) and F (flags) entries (which ordinarily are
            optional) must be present, as must the AS (appearance state) entry if the appear-
            ance dictionary AP contains more than one appearance stream. The Print and
            ReadOnly flags in the F entry must be set and all others clear (see Section 8.4.2,
            “Annotation Flags”). Table 10.48 shows an additional annotation dictionary entry
            specific to this type of annotation.

                      TABLE 10.48 Additional entries specific to a printer’s mark annotation
KEY          TYPE             VALUE

Subtype      name             (Required) The type of annotation that this dictionary describes; must be
                              PrinterMark for a printer’s mark annotation.

MN           name             (Optional) An arbitrary name identifying the type of printer’s mark, such as
                              ColorBar or RegistrationTarget.


            The form dictionary defining a printer’s mark can contain the optional entries
            shown in Table 10.49 in addition to the standard ones common to all form dictio-
            naries (see Section 4.9.1, “Form Dictionaries”).

                    TABLE 10.49 Additional entries specific to a printer’s mark form dictionary
KEY                 TYPE               VALUE

MarkStyle           text string        (Optional; PDF 1.4) A text string representing the printer’s mark in human-
                                       readable form and suitable for presentation to the user on the screen.

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