ABB EI803F 3BDH000017R1 control module
Technical data of product parameters
The dictionary must also contain an entry whose key is Default. The value of thisEI803F 3BDH000017R1
entry is a halftone dictionary to be used for any color component that does not
have an entry of its own.
When a halftone dictionary of some other type appears as the value of an entry in
a type 5 halftone dictionary, it applies only to the single colorant or color component named by that entry’s key. This is in contrast to such a dictionary’s being
used as the current halftone parameter in the graphics state, which applies to all
color components. If nonprimary colorants are requested when the current halftone is defined by any means other than a type 5 halftone dictionary, the grayEI803F 3BDH000017R1
halftone screen and transfer function are used for all such colorants.
Example 6.2 shows a type 5 halftone dictionary with the primary color components for a CMYK device. In this example, the halftone dictionaries for the color
components and for the default all use the same spot function. The final step of rendering is scan conversion. As discussed in Section 2.1.4, “Scan
Conversion,” the application executes a scan conversion algorithm to paint
graphics, text, and images in the raster memory of the output device.
The specifics of the scan conversion algorithm are not defined as part of PDF.
Different implementations can perform scan conversion in different ways; techniques that are appropriate for one device may be inappropriate for another. Still,
it is useful to have a general understanding of how scan conversion works, particularly when creating PDF documents intended for viewing on a display. At theEI803F 3BDH000017R1
low resolutions typical of displays, variations of even one pixel’s width can have a
noticeable effect on the appearance of painted shapes.
The following sections describe the scan conversion algorithms that are typical of
Acrobat products. (These details also apply to PostScript products, yielding consistent results when an application prints a document on a PostScript printer.)
Most scan conversion details are not under program control, but a few are; the
parameters for controlling them are described here
Product picture display
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