ABB DX581-S control main board DCS system module

ABB DX581-S control main board DCS system module

Technical data of product parameters

Like type 10, a type 16 halftone DX581-S defines 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 rectangle or two rectangles. If two rectangles are specified, they tile the device space as shown in Figure 6.5. The last row in the firstDX581-S
rectangle is immediately adjacent to the first row in the second and starts in the
same column.A type 16 halftone, like type 6 and type 10, is represented as a stream containing
the threshold values, with the parameters defining the halftone specified by entries in the stream dictionary. This dictionary can contain the entries shown in
Table 6.6 in addition to the usual entries common to all streams (see Table 3.4 on
page 62). The dictionary’s Width and Height entries define the dimensions of theDX581-S
first (or only) rectangle. The dimensions of the second, optional rectangle are defined by the optional entries Width2 and Height2. Each threshold value is repreSome 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 specified for an arbitrary number of colorants or color
components.
A type 5 halftone dictionary (Table 6.7) is a composite dictionary containing
independent halftone definitions for multiple colorants. Its keys are name objects
representing the names of individual colorants or color components. The valuesDX581-S
associated with these keys are other halftone dictionaries, each defining the halftone screen and transfer function for a single colorant or color component. The
component halftone dictionaries may be of any supported type except

Product picture display

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