HalftoneType in Java

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HalftoneName Xsquare Ysquare TransferFunction
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The Xsquare and Ysquare entries specify the dimensions of the two squares in device pixels; the stream must contain Xsquare 2 + Ysquare 2 bytes, each representing a single threshold value The contents of square X are speci ed rst, followed by those of square Y Threshold values within each square 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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Like type 10, a type 16 halftone (PDF 13) de nes a halftone screen with a threshold array and allows nonzero screen angles In type 16, however, each element of the threshold array is 16 bits wide instead of 8 This allows the threshold array to distinguish 65,536 levels of color rather than only 256 levels The threshold array can consist of either one or two rectangles If two rectangles are speci ed, they will tile the device space as shown in Figure 65 The last row in the rst rectangle is immediately adjacent to the rst row in the second and starts in the same column
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FIGURE 65 Tiling of device space in a type 16 halftone
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A type 16 halftone, like type 6 and type 10, is represented as a stream containing the threshold values, with the parameters de ning the halftone speci ed by entries in the stream dictionary Table 66 shows the contents of this dictionary, in addition to the usual entries common to all streams (see Table 34 on page 38) The dictionary s Width and Height entries de ne the dimensions of the rst (or only) rectangle; those of the second, optional rectangle are de ned by the optional entries Width2 and Height2 Each threshold value is represented as 2 bytes, with the high-order byte rst The stream must thus contain 2 Width Height bytes if there is only one rectangle, or 2 (Width Height + Width2 Height2) bytes if there are two The contents of the rst rectangle are speci ed rst, followed by those of the second rectangle Threshold values within each rectangle 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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TABLE 66 Additional entries speci c to a type 16 halftone dictionary
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KEY TYPE VALUE
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Type HalftoneType HalftoneName Width Height Width2
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(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 16 for this type of halftone (Optional) The name of the halftone dictionary (Required) The width of the rst (or only) rectangle in the threshold array, in device pixels (Required) The height of the rst (or only) rectangle in the threshold array, in device pixels (Optional) The width of the optional second rectangle in the threshold array, in device pixels If this entry is present, the Height2 entry must be present as well; if this entry is absent, the Height2 entry must also be absent and the threshold array has only one rectangle (Optional) The height of the optional second rectangle in 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, below) 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
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Type 5 Halftones
Some devices, particularly color printers, require separate halftones for each individual colorant Also, devices that can produce named separations may require individual halftones for each separation Halftone dictionaries of type 5 allow individual halftones to be speci ed for an arbitrary number of colorants or color components