Adobe Acrobat SDK
Implementation Notes
Adobe® Supplement to the ISO 32000
Implementation Notes to the PDF Reference, sixth edition 112
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4.5.2 Color Space Families
47. If an Acrobat viewer encounters an unknown color space family name, it displays an error specifying
the name, but reports no further errors thereafter.
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 version 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 thereafter.
4.8.4 Image Dictionaries
52. Image XObjects in PDF 1.2 and earlier versions are all implicitly unmasked 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.
