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TransferFunction
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If the optional entry AccurateScreens is present with a boolean value of true, a highly precise halftoning algorithm is substituted in place of the standard one; if the AccurateScreens entry is false or is not present, ordinary halftoning is used Accurate halftoning achieves the requested screen frequency and angle with very high accuracy, whereas ordinary halftoning adjusts them so that a single screen cell is quantized to device pixels High accuracy is important mainly for making color separations on high-resolution devices However, it may be computationally expensive and so is ordinarily disabled
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CHA P TE R 6
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In principle, PDF permits the use of halftone screens with arbitrarily large cells in other words, arbitrarily low frequencies However, cells that are very large relative to the device resolution or that are oriented at unfavorable angles may exceed the capacity of available memory If this happens, an error will occur The AccurateScreens feature often requires very large amounts of memory to achieve the highest accuracy Example 61 shows a halftone dictionary for a type 1 halftone
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Example 61 28 0 obj << /Type /Halftone /HalftoneType 1 /Frequency 120 /Angle 30 /SpotFunction /CosineDot /TransferFunction /Identity >> endobj
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Type 6 Halftones
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A type 6 halftone de nes a halftone screen with a threshold array The halftone is represented as a stream containing the threshold values; the parameters de ning the halftone are speci ed by entries in the stream dictionary Table 64 shows the contents of this dictionary, in addition to the usual entries common to all streams (see Table 34 on page 38) The Width and Height entries specify the dimensions of the threshold array in device pixels; the stream must contain Width Height bytes, each representing a single threshold value Threshold values are de ned in device space in the same order as image samples in image space (see Figure 426 on page 265), with the rst value at device coordinates (0, 0) and horizontal coordinates changing faster than vertical
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Although type 6 halftones can be used to specify a threshold array with a zero screen angle, they make no provision for other angles The type 10 halftone removes this restriction and allows the use of threshold arrays for halftones with nonzero screen angles as well
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TABLE 64 Additional entries speci c to a type 6 halftone dictionary
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KEY TYPE VALUE
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Type HalftoneType HalftoneName Width Height TransferFunction
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name integer string integer integer function or name
(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 6 for this type of halftone (Optional) The name of the halftone dictionary (Required) The width of the threshold array, in device pixels (Required) The height of the threshold array, in device pixels (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
Halftone cells at nonzero angles can be dif cult to specify, because they may not line up well with scan lines and because it may be dif cult to determine where a given sampled point goes The type 10 halftone addresses these dif culties by dividing the halftone cell into a pair of squares that line up at zero angles with the output device s pixel grid The squares contain the same information as the original cell, but are much easier to store and manipulate In addition, they can be mapped easily into the internal representation used for all rendering Figure 62 shows a halftone cell with a frequency of 384 cells per inch and an angle of 502 degrees, represented graphically in device space at a resolution of 300 dots per inch Each asterisk in the gure represents a location in device space that is mapped to a speci c location in the threshold array