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S E C T I O N H .3                                          Implementation Notes



4.5.5, “Special Color Spaces” (DeviceN Color Spaces)
  48. Acrobat viewers support the special meaning of None only when a
      DeviceN color space is used as a base color for an indexed color space. For
      all other uses of DeviceN, None is treated as a regular spot color name.


4.5.5, “Special Color Spaces” (Multitone Examples)
  49. This method of representing multitones is used by Adobe Photoshop 5.0.2
      and subsequent versions when exporting EPS files. Beginning with ver-
      sion 4.0, Acrobat exports Level 3 EPS files using this method, and can also
      export Level 1 EPS files that use the “Level 1 separation” conventions of
      Adobe Technical Note #5044, Color Separation Conventions for PostScript
      Language Programs. These conventions are used to emit multitone images
      as calls to “customcolorimage” with overprinting, which can then be
      placed in page layout applications such as Adobe PageMaker®, Adobe
      In-Design, and QuarkXPress.

4.6, “Patterns”
  50. Acrobat viewers earlier than version 4.0 do not display patterns on the
      screen, although they do print them to PostScript output devices.

4.7, “External Objects”
  51. Acrobat viewers that encounter an XObject of an unknown type display
      an error specifying the type of XObject but report no further errors there-
      after.

4.8.4, “Image Dictionaries”
  52. Image XObjects in PDF 1.2 and earlier versions are all implicitly un-
      masked images. A PDF consumer that does not recognize the Mask entry
      treats the image as unmasked without raising an error.
  53. All Acrobat viewers ignore the Name entry in an image dictionary.

4.8.5, “Masked Images”
  54. Explicit masking and color key masking are features of PostScript Lan-
      guageLevel 3. Acrobat 4.0 and later versions do not attempt to emulate the

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