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                                       1124
APPENDIX H                                    Compatibility and Implementation Notes



      number of colors - 1. Acrobat 6.0 can handle this case properly, as well as
      the correct value of hival; for compatibility with 5.0 viewers, it is necessary
      to specify hival as the number of colors.
      Also, Acrobat viewers do not support authoring or rendering posters
      when the value of Poster is true.
153. Acrobat viewers treat a FWScale value of [999 1] as full screen.
154. Acrobat viewers never allow any portion of a floating window to be off-
     screen.


9.4, “Alternate Presentations”
155. The PDF language contains no direct method of initiating an alternate
     presentation-defined slideshow. Instead, a slideshow is invoked by a
     JavaScript call that is typically triggered by an interactive form element
     (see Section 8.6, “Interactive Forms”). Refer to the JavaScript for Acrobat
     API Reference (see the Bibliography) for information on starting and stop-
     ping a slideshow using JavaScript.
156. The only type of slideshow supported in Acrobat 5.1 and later is an SVG
     slideshow (MIME content type image/svg+xml). Acrobat supports the
     Scalable Vector Graphics (SVG) 1.0 Specification defined by the W3C (see
     the Bibliography). Implementation notes on support of SVG by Adobe
     products are available at <http://www.adobe.com/svg/>.
      All resources must be either image XObjects (see Section 4.8.4, “Image
      Dictionaries”) or embedded file streams (see Section 3.10.3, “Embedded
      File Streams”).
      • Image XObjects used for slideshows must use the DCTDecode filter and
        an RGB color space. Color profile information must be specified in the
        image XObject dictionary as well as embedded within the JPEG stream.
      • Embedded audio files must be of type   .wav (supported on Windows
        only, MIME type audio/x-wav) or .mp3 (MIME type audio/mpeg, docu-
        mented at <http://www.chiariglione.org/mpeg/index.htm>).
      • Embedded video must be QuickTime-compatible files of type                .avi
        (MIME type video/ms-video) or .mov (MIME type video/quicktime,
        documented on Apple’s Developer Connection site at <http://develop-
        er.apple.com>. To play video, a QuickTime player (version 3 or later)
        must be installed.

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