Xerox 721P87491 manual Considerations, Summary

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POSTSCRIPT

Considerations

The scan order of an image relative to the content of the image is not important. It is important that the scan order of the image in the desired orientation is relative to the scan order of the page.

There are circumstances when a transformation cannot be avoided by any ordering of image data (such as when the image sides are not parallel to the sides of the paper, or when the image is skewed), but for many cases a rotation can be avoided by ensuring that the data in the image is in the correct order.

Ensuring optimum image data order is complicated by the fact that the rotations are not tied to the use of the rotate operator in a PostScript program, or to implied rotations in the image-to-user space transformation. The transformations specified in PostScript are part of a specification of the desired position of an image in terms of the default user coordinate system.

DocuPrint NPS only performs an image rotation when one is required. Rotations of multiples of 90 degrees are optimized so that the impact is not too great.

Because the data is already aligned with the printing orientation, DocuPrint NPS does not perform any rotation of the image. In the default user coordinate system, a rotate operation is required.

Without the rotate operation, the PostScript specifies that the image be placed on the page with its left edge (fast scan dimension) parallel to the short edge of the paper. A 90 degree counterclockwise rotation of the coordinate system is needed to correctly specify the image orientation on the page.

It may be possible to arrange an appropriate order for the data by correctly arranging the original when a scan is performed. It is assumed that scanners produce data from a portrait scan in left-to- right (fast scan), top-to-bottom (slow scan) order.

By rotating the original 90 degrees clockwise, you can obtain data from the scanner with the fast scan direction bottom-to-top (relative to the original), and the slow scan direction left-to-right, matching the page scan directions for the correct output orientation. Alternatively, you can have the data reordered by a program before the PostScript master is created.

After determining that a certain scan orientation produces data in the optimum order for printing, you can scan an image and import it into an emitter. Some rotation may be necessary to place the image correctly.

If the emitter performs a rotation by manipulating the data, then the resulting PostScript master may have the data in the incorrect order. It is also possible that the emitter may not alter the data and change the transformations specified in PostScript so that the initial ordering is preserved.

Summary

To minimize imaging time, make sure that no data transformations need to be performed at the printer. Order the image data so that the fast and slow scan directions match the output fast and slow scan directions when the image is in the correct orientation on the page. With the image data correctly ordered, arrange the PostScript transformations so that they specify the position and orientation of

XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES

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Contents Version 7.1 August 2000 721P87491 Page Laser safety Operation safetyOzone information Conductor may result in risk of electrical shock. grounding Table of contents PostScript Index VippViii Contents About this guideConventions Introduction Related publications Related informationPostScript publications Vipp publication HP PCL 5 publicationsMaintaining image quality PCLOFF PCL 5 font support PCL 5 media supportPCL 5 fonts installed with NPS software PCL command support PJL commandsPCL Copy command Duplex PCL Copy command example PCL Copy command examplePCL Duplex commands DocuPrint NPS Collated HP LaserJet 4si PCL Duplex commandsPCL Job Separation command PCL media selection PCL Paper Source command tray assignmentPrecedence in selecting media PCL Offset Registration commands PCL Output Bin commandPCL 5 coding recommendations PCL 5c supportPCL 5c functions not applicable to DocuPrint NPS PCL 5c coding recommendationsLimitations for custom PCL 5c drivers Driver recommendations for PCL 5cCoordinate system default matrix Implementation-dependent operationsFloating-point arithmetic and math operators Fonts Adobe Type1 PostScript fontsFont Typeface User-defined fonts Loading fontsType 1 fonts Using Adobe Type 1 fontsProducing Type 1 fonts for use with DocuPrint Using a Type 1 font in a documentPostScript with embedded PJL commands PostScript language extensionsSystem Dict Server Dict User DictStatus Dict IdleTime DictionaryDfltkIdleArry needflush Nonstandard definitions Appearance consistency Printer resolution and resolution enhancementExamples of nonstandard definitions Statusdict UserdictDpi image Printed on a 300 dpi printer Printer imaging characteristics Proprietary PostScript extensions Font consistencyControl-D as binary data and end-of-job Control-Z and superfluous errorsSolution to control-Z and control-D problems Multiple jobs in one input file Simulated mixed plex DocuPrint NPS implementation of PostScript LevelPrinter Controller operations Scan conversion detailsStroke Shapes FillZero-width lines strokes Curved shapesImages Image quality Rendering of color and gray values transfer function Implementation limits PostScript printer description PPD filesFile operators and standard devices Implementation limitsQuantity Limit Description PostScript VM limits Path limitsSetCacheDevice Device orientation and setscreen operatorPostScript storage object size limits Obsolete operators-banddevice, framedevice, renderbandsArc to Bezier conversion-pathforall Creating the necessary PostScript Ccitt Group 3 Print performance related to image printingScan order and rotation Image orientation mismatch a PurposeImage orientation mismatch B 10.Image pixel sequence example Summary Considerations11.Scaling and resolution example Scan resolution and scaling12.PostScript with embedded image normal scan order MaxX exch def /minY exch def /minX exch def 14.Actual PostScript print Page Vipp Operating environment FunctionalityVipp line mode extension XGFNub Page Ccitt SymbolsIndex PCL PPD Index

721P87491 specifications

The Xerox 721P87491 is a remarkable printing device that showcases advanced technology tailored for professional environments, ensuring high-quality output and efficiency. Aimed at meeting the demands of busy offices, this model is recognized for its reliability and innovative features.

At the core of the Xerox 721P87491's appeal is its robust printing capabilities. It offers an impressive resolution, enabling the production of crisp and clear documents, whether in black and white or color. This high-resolution output is particularly essential for businesses that require detailed graphics, intricate charts, or professional-grade presentations.

One of the standout features of the Xerox 721P87491 is its impressive speed. It is designed to handle high-volume printing, significantly enhancing productivity in fast-paced work environments. With a rapid print speed per minute, users can expect swift processing of print jobs, ensuring that document delivery times are minimized.

The device also boasts advanced connectivity options. It supports both wired and wireless connections, allowing for seamless integration into a variety of office networks. This flexibility facilitates printing from multiple devices, including desktop computers, laptops, and mobile devices, enhancing overall workflow and collaboration within teams.

Additionally, the Xerox 721P87491 incorporates user-friendly interface options. With an intuitive touchscreen display, navigating the printer's functions becomes simpler. Users can easily access common features, adjust settings, and manage print jobs efficiently.

Another notable characteristic is its advanced security features. Given today's emphasis on data protection, the Xerox 721P87491 is equipped with robust security protocols to safeguard sensitive documents. It includes features like secure print, which holds documents until the authorized user enters a PIN, ensuring confidentiality in high-stakes environments.

Moreover, the Xerox 721P87491 demonstrates an emphasis on environmental sustainability. It is designed to be energy efficient, reducing power consumption during both idle and active states. The printer also supports duplex printing, which helps decrease paper use, contributing to a more sustainable office practice.

In summary, the Xerox 721P87491 is a versatile printing solution that merges efficiency, quality, and advanced technology. With high-speed printing, intuitive controls, robust security features, and a commitment to sustainability, it stands out as an excellent choice for businesses aiming to boost productivity while maintaining high standards. Its capabilities make it a worthy investment for any modern office environment.
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