ABB 3BSE043660R1 CI867K01 Tensioner
Technical data of product parameters
Consider a halftone cell to have its own coordinate system: the center of the cell is
the origin and the corners are at coordinates ±1.0 horizontally and vertically.
Each pixel in the cell is centered at horizontal and vertical coordinates that both
lie in the range −1.0 to +1.0. For each pixel, the spot function is invoked with the3BSE043660R1 CI867K01
pixel’s coordinates as input and must return a single number in the range −1.0 to
+1.0, defining the pixel’s position in the whitening order.
The specific values the spot function returns are not significant; all that matters
are the relative values returned for different pixels. As a cell’s gray level varies
from black to white, the first pixel whitened is the one for which the spot function
returns the lowest value, the next pixel is the one with the next higher spot function value, and so on. If two pixels have the same spot function value, their relative order is chosen arbitrarily.
PDF provides built-in definitions for many of the most commonly used spot
functions. A halftone can simply specify any of these predefined spot functions3BSE043660R1 CI867K01
by name instead of giving an explicit function definition. For example, the name
SimpleDot designates a spot function whose value is inversely related to a pixel’s
distance from the center of the halftone cell. This produces a “dot screen” in
which the black pixels are clustered within a circle whose area is inversely proportional to the gray level. The predefined function Line is a spot function whose
value is the distance from a given pixel to a line through the center of the cell,
producing a “line screen” in which the white pixels grow away from that line. finition of each function along with the corresponding PostScript language
code as it would be defined in a PostScript calculator function (see Section 3BSE043660R1 CI867K01
“Type 4 (PostScript Calculator) Functions”). The image accompanying each
function shows how the relative values of the function are distributed over the
halftone cell, indicating the approximate order in which pixels are whitened. Pixels corresponding to darker points in the image are whitened later than those corresponding to lighter points.
Product picture display
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