ABB CI868K01-eA 3BSE048845R2 processor control unit
Technical data of product parameters
Halftone dictionaries have an optional entry, HalftoneName, that identifies the
halftone by name. InCI868K01-eA 3BSE048845R2, if this entry is present, all other entries, including
HalftoneType, are optional. At rendering time, if the output device has a halftone
with the specified name, that halftone is used, overriding any other halftone parameters specified in the dictionary. This provides a way for PDF documents to select the proprietary halftones supplied by some device manufacturers, which
would not otherwise be accessible because they are not explicitly defined in PDF.
If there is no HalftoneName entry, or if the requested halftone name does not exist on the device, the halftone’s parameters are defined by the other entries in theCI868K01-eA 3BSE048845R2
dictionary, if any. If no other entries are present, the default halftone is used.
See Section 7.6.4, “Rendering Parameters and Transparency,” and in particular,
“Halftone and Transfer Function” on page 573, for further discussion of the role
of halftones in the transparent imaging model. If the AccurateScreens entry has a value of true, a highly precise halftoning algorithm is substituted in place of the standard one. If AccurateScreens is false or not
present, ordinary halftoning is used. Accurate halftoning achieves the requested
screen frequency and angle with very high accuracy, whereas ordinary halftoning
adjusts them so that a single screen cell is quantized to device pixels. High accuracy is important mainly for making color separations on high-resolution devices. However, it may be computationally expensive and therefore is ordinarily
disabled.CI868K01-eA 3BSE048845R2
In principle, PDF permits the use of halftone screens with arbitrarily large cells—
in other words, arbitrarily low frequencies. However, cells that are very large
relative to the device resolution or that are oriented at unfavorable angles may exceed the capacity of available memory. If this happens, an error occurs. The
AccurateScreens feature often requires very large amounts of memory to achieve
the highest accuracy.
Product picture display
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