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In PDF 12, the graphics state includes a current halftone parameter, which determines the halftoning process to be used by the painting operators The current halftone can be speci ed as the value of the HT entry in a graphics state parameter dictionary; see Table 48 on page 157 It may be de ned by either a dictionary or a stream, depending on the type of halftone; the term halftone dictionary is used generically throughout this section to refer to either a dictionary object or the dictionary portion of a stream object (Those halftones that are de ned by streams are speci cally identi ed as such in the descriptions of particular halftone types; unless otherwise stated, they are understood to be de ned by simple dictionaries instead) Every halftone dictionary must have a HalftoneType entry whose value is an integer specifying the overall type of halftone de nition The remaining entries in the dictionary are interpreted according to this type PDF supports the halftone types listed in Table 62
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TABLE 62 PDF halftone types
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De nes a single halftone screen by a frequency, angle, and spot function De nes an arbitrary number of halftone screens, one for each colorant or color component (including both primary and spot colorants) The keys in this dictionary are names of colorants; the values are halftone dictionaries of other types, each de ning the halftone screen for a single colorant De nes a single halftone screen by a threshold array containing 8-bit sample values De nes a single halftone screen by a threshold array containing 8-bit sample values, representing a halftone cell that may have a nonzero screen angle (PDF 13) De nes a single halftone screen by a threshold array containing 16bit sample values, representing a halftone cell that may have a nonzero screen angle
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The dictionaries representing these halftone types contain the same entries as the corresponding PostScript language halftone dictionaries (as described in Section 74 of the PostScript Language Reference, Third Edition), with the following exceptions:
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The PDF dictionaries may contain a Type entry with the value Halftone, identifying the type of PDF object that the dictionary describes
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Spot functions and transfer functions are represented by function objects instead of PostScript procedures
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Threshold arrays are speci ed as streams instead of les In type 5 halftone dictionaries, the keys for colorants must be name objects;
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they may not be strings as they may in PostScript Halftone dictionaries have an optional entry, HalftoneName, that identi es the desired halftone by name In PDF 13, if this entry is present, all other entries, including HalftoneType, are optional At rendering time, if the output device has a halftone with the speci ed name, that halftone will be used, overriding any other halftone parameters speci ed in the dictionary This provides a way for PDF documents to select the proprietary halftones supplied by some device manufacturers, which would not otherwise be accessible because they are not explicitly de ned in PDF If there is no HalftoneName entry, or if the requested halftone name does not exist on the device, the halftone s parameters are de ned by the other entries in the dictionary, if any If no other entries are present, the default halftone is used See Section 764, Rendering Parameters and Transparency, and in particular Halftone and Transfer Function on page 467, for further discussion of the role of halftones in the transparent imaging model
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Type 1 Halftones
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Table 63 describes the contents of a halftone dictionary of type 1, which de nes a halftone screen in terms of its frequency, angle, and spot function
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TABLE 63 Entries in a type 1 halftone dictionary
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KEY TYPE VALUE
Type HalftoneType HalftoneName Frequency Angle
name integer string number number
(Optional) The type of PDF object that this dictionary describes; if present, must be Halftone for a halftone dictionary (Required) A code identifying the halftone type that this dictionary describes; must be 1 for this type of halftone (Optional) The name of the halftone dictionary (Required) The screen frequency, measured in halftone cells per inch in device space (Required) The screen angle, in degrees of rotation counterclockwise with respect to the device coordinate system (Note that most output devices have left-handed device spaces; on such devices, a counterclockwise angle in device space will correspond to a clockwise angle in default user space and on the physical medium) (Required) A function object de ning the order in which device pixels within a screen cell are adjusted for different gray levels, or the name of one of the prede ned spot functions (see Table 61 on page 385) (Optional) A ag specifying whether to invoke a special halftone algorithm that is extremely precise, but computationally expensive; see below for further discussion Default value: false (Optional) A transfer function, which overrides the current transfer function in the graphics state for the same component This entry is required if the dictionary is a component of a type 5 halftone (see Type 5 Halftones on page 400) and represents either a nonprimary or nonstandard primary color component (see Section 63, Transfer Functions ) The name Identity may be used to specify the identity function