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APPENDIX H                                   Compatibility and Implementation Notes



      effect of masked images when printing to LanguageLevel 1 or Lan-
      guageLevel 2 output devices; they print the base image without the mask.
      The Acrobat 4.0 viewer displays masked images, but only when the
      amount of data in the mask is below a certain limit. Above that, the viewer
      displays the base image without the mask.

4.9.1, “Form Dictionaries”
 55. All Acrobat viewers ignore the Name entry in a form dictionary.


4.9.3, “Reference XObjects
 56. Acrobat 6.0 and earlier viewers do not implement reference XObjects. The
     proxy is always used for viewing and printing.

5.2.5, “Text Rendering Mode”
 57. In Acrobat 4.05 and earlier versions, text-showing operators such as Tj
     first perform the fills for all the glyphs in the string being shown, followed
     by the strokes for all the glyphs. This produces incorrect results if glyphs
     overlap.


5.3.2, “Text-Showing Operators”
 58. In versions of Acrobat earlier than 3.0, the horizontal coordinate of the
     text position after the TJ operator paints a character glyph and moves by
     any specified offset must not be less than it was before the glyph was
     painted.
 59. In Acrobat 4.0 and earlier viewers, position adjustments specified by num-
     bers in a TJ array are performed incorrectly if the horizontal scaling pa-
     rameter, Th , is different from its default value of 100.

5.5.1, “Type 1 Fonts”
 60. All Acrobat viewers ignore the Name entry in a font dictionary.
 61. Acrobat 5.0 and later viewers use the glyph widths stored in the font dic-
     tionary to override the widths of glyphs in the font program itself, which
     improves the consistency of the display and printing of the document.
     This addresses the situation in which the font program used by the viewer

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