At the moment the color space is set to a DeviceN space, the viewer application in Java

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At the moment the color space is set to a DeviceN space, the viewer application
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will select the requested set of colorants only if all of them are available on the
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device; otherwise, it will select the alternate color space designated by the alternateSpace parameter
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The tint transformation function is called with n tint values and must return
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the corresponding m color component values, where n is the number of components needed to specify a color in the DeviceN color space and m is the number required by the alternate color space In a DeviceN color space, one or more of the colorant names in the names array may be the name None This indicates that the corresponding color component is never painted on the page, as in a Separation color space for the None colorant When a DeviceN color space is painting the named device colorants directly, color components corresponding to None colorants are discarded However, when the DeviceN color space reverts to its alternate color space, those components are passed to the tint transformation function, which may use them in any desired manner Note: A DeviceN color space whose component colorant names are all None always discards its output, just the same as a Separation color space for None; it never reverts to the alternate color space Reversion occurs only if at least one color component (other than None) is speci ed and is not available on the device The optional attributes parameter is a dictionary containing additional information about the color space At the time of publication, only one entry is de ned in this dictionary, as shown in Table 420
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TABLE 420 Entry in a DeviceN color space attributes dictionary
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KEY TYPE VALUE
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Colorants
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dictionary
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(Optional) A dictionary describing the individual colorants used in the DeviceN color space For each entry in this dictionary, the key is a colorant name and the value is an array de ning a Separation color space for that colorant (see Separation Color Spaces on page 201) The key must match the colorant name given in that color space The dictionary need not list all colorants used in the DeviceN color space and may list additional colorants This dictionary has no effect on the operation of the DeviceN color space itself or the appearance that it produces However, it provides information about the individual colorants that may be useful to some applications In particular, the alternate color space and tint transformation function of a Separation color space describe the appearance of that colorant alone, whereas those of a DeviceN color space describe only the appearance of its colorants in combination
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Example 412 shows a DeviceN color space consisting of three color components named Orange, Green, and None In this example, the DeviceN color space, object 30, has an attributes dictionary whose Colorants entry is an indirect reference to object 45 (which might also be referenced by attributes dictionaries of other DeviceN color spaces) tintTransform1, whose de nition is not shown, maps three color components (tints of the colorants Orange, Green, and None) to four color components in the alternate color space, DeviceCMYK tintTransform2 maps a single color component (an orange tint) to four components in DeviceCMYK Likewise, tintTransform3 maps a green tint to DeviceCMYK, and tintTransform4 maps a tint of PANTONE 131 to DeviceCMYK
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Example 412 30 0 obj [ /DeviceN [/Orange /Green /None] /DeviceCMYK tintTransform1 << /Colorants 45 0 R >> ] endobj 45 0 obj << /Orange [ /Separation /Orange /DeviceCMYK tintTransform2 ] /Green [ /Separation /Green /DeviceCMYK tintTransform3 ] /PANTONE#20131 [ /Separation /PANTONE#20131 /DeviceCMYK tintTransform4 ] >> endobj % Color space
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% Colorants dictionary
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See Section 762, Spot Colors and Transparency, for further discussion of the role of DeviceN color spaces in the transparent imaging model
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Multitone Examples
The following examples illustrate various interesting and useful special cases of the use of Indexed and DeviceN color spaces in combination to produce multitone colors Examples 413 and 414 illustrate the use of DeviceN to create duotone color spaces In Example 413, an Indexed color space maps index values in the range 0 to 255 to a duotone DeviceN space in cyan and black In effect, the index values are treated as if they were tints of the duotone space, which are then mapped into tints of the two underlying colorants Only the beginning of the lookup table string for the Indexed color space is shown; the full table would contain 256 twobyte entries, each specifying a tint value for cyan and black, for a total of 512 bytes If the alternate color space of the DeviceN space is selected, the tint transformation function (object 15 in the example) maps the two tint components for cyan and black to the four components for a DeviceCMYK color space by supplying zero values for the other two components Example 414 shows the de nition of another duotone color space, this time using black and gold colorants (where gold is a spot colorant) and using a CalRGB space as the alternate color space This could be de ned in the same way as in the preceding example, with a tint transformation function that converts from the two tint components to colors in the alternate CalRGB color space
Example 413 10 0 obj [ /Indexed [ /DeviceN [/Cyan /Black] /DeviceCMYK 15 0 R ] 255 <6605 6806 6907 6B09 6C0A > ] endobj % Color space