Xerox 721P87491 manual Image quality

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POSTSCRIPT

—The resolution of the source image (sample image) is lower than the device space, and the scaling of source-image-to- device space is an integer multiple and rotation is in multiples of 90 degrees.

•Scan Conversion paints any pixel whose square region intersects the shape if the resolution of the source image is lower than that of device space, and the scaling between source image and device space is not an integer multiple.

This effect is noticeable when you are printing a sampled image with a resolution of less than 600 dpi on the printer at 600 dpi.

Image quality

DocuPrint NPS output is superior to that of other printers that use “write-black” technology in the following areas:

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Black regions are darker.

Fonts of small point sizes are more readable.

Single-pixel-wide white lines on a black background are visible.

Note: The DocuPrint 92C NPS can produce a single-pixel line. However, because of the many variables involved, such as print density settings and line placement on the page, Xerox cannot guarantee the quality of these single-pixel lines. Specific questions regarding single-pixel line printing for your application should be directed to your Xerox service engineer.

Some user-defined fonts use either outlines or bitmaps that are tuned to write-black printers. As a result, these fonts appear light on the Xerox DocuPrint printers. Character rasterization for fonts that use PostScript painting operators is subject to the scan conversion rules described earlier in this chapter.

It is often difficult to determine if a PostScript master uses user- defined fonts. To do so requires studying the master in detail, unless the creator has followed the standards suggested in the PostScript reference manual and specified the fonts used by the document in a PostScript comment format. An example of this format is:

%%DocumentFonts: { <fontname> ...}

%%DocumentSuppliedFonts:{ <fontname> ...}

However, if the character shapes seem poorly rasterized, user- defined fonts probably are contained in the master. When possible, use Type 1 fonts, which are rasterized through special techniques, for best output quality.

Note that the DocuPrint PostScript interpreter applies thickening to certain graphics-rendering operations. For example, outline fonts in the Type 1 format are subject to rasterization techniques that use thickening for best quality of text rendering on Xerox devices.

XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES

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Contents Version 7.1 August 2000 721P87491 Page Ozone information Laser safetyOperation safety Conductor may result in risk of electrical shock. grounding Table of contents PostScript Index VippViii Conventions ContentsAbout this guide Introduction PostScript publications Related publicationsRelated information Vipp publication HP PCL 5 publicationsMaintaining image quality PCLOFF PCL 5 font support PCL 5 media supportPCL 5 fonts installed with NPS software PCL Copy command PCL command supportPJL commands 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 5cFloating-point arithmetic and math operators Coordinate system default matrixImplementation-dependent operations Font Typeface FontsAdobe Type1 PostScript fonts 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 documentSystem Dict PostScript with embedded PJL commandsPostScript language extensions Server Dict User DictDfltkIdleArry needflush Status DictIdleTime Dictionary Nonstandard definitions Statusdict Userdict Printer resolution and resolution enhancementAppearance consistency Examples of nonstandard definitionsDpi 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 LevelStroke Printer Controller operationsScan conversion details Shapes FillImages Zero-width lines strokesCurved shapes Image quality Rendering of color and gray values transfer function Implementation limits PostScript printer description PPD filesQuantity Limit Description File operators and standard devicesImplementation limits Device orientation and setscreen operator Path limitsPostScript VM limits SetCacheDeviceArc to Bezier conversion-pathforall PostScript storage object size limitsObsolete operators-banddevice, framedevice, renderbands Scan order and rotation Creating the necessary PostScript Ccitt Group 3Print performance related to image printing 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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