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                                      1112
APPENDIX H                                   Compatibility and Implementation Notes



      puts the name of that function into the halftone dictionary; Acrobat uses
      that function when printing the PDF document to a PostScript output de-
      vice. If the code does not match any of the predefined spot functions, Dis-
      tiller samples the specified spot function and generates a function for the
      halftone dictionary; when printing to a PostScript device, Acrobat gener-
      ates a spot function that interpolates values from that function.
      When producing PDF version 1.3 or later, Distiller represents the spot
      function by using a Type 4 (PostScript calculator) function whenever pos-
      sible (see Section 3.9.4, “Type 4 (PostScript Calculator) Functions”). In
      this case, Acrobat uses this function directly when printing the document.


6.5.4, “Automatic Stroke Adjustment”
 71. When drawing to the screen, Acrobat 6.0 always performs automatic
     stroke adjustment, regardless of the value of the SA entry in the graphics
     state parameter dictionary.


7.5.2, “Specifying Blending Color Space and Blend Mode”
 72. PDF 1.3 or earlier viewers ignore all transparency-related graphics state
     parameters (blend mode, soft mask, alpha constant, and alpha source). All
     graphics objects are painted opaquely.
  Note: This implementation note is also referred to in Sections 7.5.3, “Specifying
  Shape and Opacity” (Mask Shape and Opacity, Constant Shape and Opacity)
  and 7.5.4, “Specifying Soft Masks” (Soft-Mask Dictionaries).

7.5.3, “Specifying Shape and Opacity” (Mask Shape and Opacity)
 73. PDF 1.3 or earlier viewers ignore the SMask entry in an image dictionary.
     All images are painted opaquely.
  Note: This implementation note is also referred to in Section 7.5.4, “Specifying
  Soft Masks” (Soft-Mask Images).


8.2.2, “Document Outline”
 74. In PDF 1.2, an additional entry in the outline item dictionary, named AA,
     was defined but was never implemented. Beginning with PDF 1.3, this
     entry is obsolete and should be ignored.

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