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                                                     1046
          APPENDIX F                                                                 Linearized PDF



ITEM   SIZE (BITS)                DESCRIPTION

4      See Table F.5, item 5      A number equal to 1 less than the number of objects in the group. The first
                                  object of the first page is the one whose object number is given by the O entry
                                  in the linearization parameter dictionary at the beginning of the file. Object
                                  numbers for subsequent entries can be determined by accumulating the
                                  number of objects in all previous entries until all shared objects in the first
                                  page have been enumerated. Following that, the first object in the shared
                                  objects section has a number that can be obtained from the header section of
                                  the shared object hint table (Table F.5, item 1). (See also implementation note
                                  187 in Appendix H.)

          Note: In a document consisting of only one page, all of that page’s objects are never-
          theless treated as if they were shared; the shared object hint table reflects this. (See
          implementation note 188 in Appendix H.)


    F.3.3 Thumbnail Hint Table

          The thumbnail hint table consists of a header section (Table F.7) followed by the
          thumbnails section, which includes one or more per-page entries (Table F.8), each
          of which describes the thumbnail image for a single page. The entries are in page
          number order starting with page 0, even if the document catalog contains an
          OpenAction entry that specifies opening at some page other than page 0. Thumb-
          nail images may exist for some pages and not for others.

                               TABLE F.7 Thumbnail hint table, header section
ITEM           SIZE (BITS)        DESCRIPTION

1              32                 The object number of the first thumbnail image (that is, the thumbnail image
                                  that is described by the first entry in the thumbnails section).

2              32                 The location of the first thumbnail image.

3              32                 The number of pages that have thumbnail images.

4              16                 The number of bits needed to represent the greatest number of consecutive
                                  pages that do not have a thumbnail image.

5              32                 The least length of a thumbnail image in bytes.

6              16                 The number of bits needed to represent the difference between the greatest
                                  and least length of a thumbnail image.

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