ABB DTDX991A 61430001-UW module

ABB DTDX991A 61430001-UW module

Technical data of product parameters

A type 6 halftone defines a halftone screen with a threshold array. The halftone isDTDX991A 61430001-UW
represented as a stream containing the threshold values; the parameters defining
the halftone are specified by entries in the stream dictionary. This dictionary can
contain the entries shown in Table 6.4 in addition to the usual entries common to
all streams (see Table 3.4 on page 62). 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 defined in device space in the same order as image samples in image space
(see Figure 4.26 on page 338), with the first value at device coordinates (0, 0) andDTDX991A 61430001-UW
horizontal coordinates changing faster than vertical coordinates. Halftone cells at nonzero angles can be difficult to specify because they may not
line up well with scan lines and because it may be difficult to determine where a
given sampled point goes. The type 10 halftone addresses these difficulties 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 6.2 shows a halftone cell with a frequency of 38.4 cells per inch and anDTDX991A 61430001-UW
angle of 50.2 degrees, represented graphically in device space at a resolution of
300 dots per inch. Each asterisk in the figure represents a location in device space
that is mapped to a specific location in the threshold arrayThe Xsquare and Ysquare entries specify the dimensions of the two squares in
device pixels. The stream must contain Xsquare2 + Ysquare2
bytes, each representing a single threshold value. The contents of square X are specified first,
followed by those of square Y. Threshold values within each square are defined in
device space in the same order as image samples in image space (see Figure 4.26
on page 338), with the first value at device coordinates (0, 0) and horizontal coordinates changing faster than vertical coordinates.

Product picture display

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