Xerox 721P87491 manual Scan resolution and scaling, Scaling and resolution example

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POSTSCRIPT

the image relative to the PostScript default image and user coordinate systems.

Scan resolution and scaling

Just as rotation of an image is often required to produce correct output, scaling is also often required. To reduce imaging time, present the data so that scaling is not required; supply data for 300 dots per inch of output size in both dimensions.

Part of the image-to-user space transformation for any image is the scaling that takes image coordinates to physical coordinates in user space. DocuPrint splits the transformation into two parts. The scale operator is needed as part of the transformation from the unit square in user space (1 unit equals 1 point, which equals 1/72 inches) to the destination rectangle or parallelogram.

In the following example, the number of samples in each dimension is divided by the input resolution, giving the size of the image in inches, which is multiplied by 72 to obtain the size in points. The two computed values are used as scale factors to take the unit square to the size of the original image.

Figure 2-11.Scaling and resolution example

/lines 3296 def

% lines in

the image

/bpl 2528 def

% bits per

line

/res 300.0 def

% spots per inch of image resolution

.

 

 

.

 

 

.

 

 

bpl res div 72 mul lines res

div 72 mul scale

As with rotation, the image-to-user space transformation specifies the output size of the image, and internal scaling may or may not be required, depending on the data available. In the scaling and resolution example above, 300 samples per inch of output size were provided, and output scaling is not required.

Common cases of scaling are optimized to minimize the performance penalty. See “Performance measurement” in the Troubleshooting Guide. Recognition of optimized cases is dependent upon precise scale values. For this reason, you should always have the scale values calculated by the PostScript code as shown in the examples. Optimized scaling works well with optimized rotations.

The following example illustrates the requirements for embedding and printing an image in a normal scan.This example uses the default PostScript user coordinate system. The image data is already in the correct order for that coordinate system, so the use of the rotate operator is not required. DocuPrint NPS performs an internal rotation of the image data in order to align it properly with the print scan ordering. Three hundred samples per square inch of output size is provided and scaling is not required.

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XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES

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Contents Version 7.1 August 2000 721P87491 Page Operation safety Laser safetyOzone information Conductor may result in risk of electrical shock. grounding Table of contents PostScript Vipp IndexViii About this guide ContentsConventions Introduction Related information Related publicationsPostScript publications HP PCL 5 publications Vipp publicationPCL Maintaining image qualityOFF PCL 5 media support PCL 5 font supportPCL 5 fonts installed with NPS software PJL commands PCL command supportPCL Copy command PCL Copy command example Duplex PCL Copy command examplePCL Duplex commands PCL Duplex commands DocuPrint NPS Collated HP LaserJet 4siPCL Job Separation command PCL Paper Source command tray assignment PCL media selectionPrecedence in selecting media PCL Output Bin command PCL Offset Registration commandsPCL 5c support PCL 5 coding recommendationsPCL 5c coding recommendations PCL 5c functions not applicable to DocuPrint NPSDriver recommendations for PCL 5c Limitations for custom PCL 5c driversImplementation-dependent operations Coordinate system default matrixFloating-point arithmetic and math operators Adobe Type1 PostScript fonts FontsFont Typeface Loading fonts User-defined fontsUsing Adobe Type 1 fonts Type 1 fontsUsing a Type 1 font in a document Producing Type 1 fonts for use with DocuPrintPostScript language extensions PostScript with embedded PJL commandsSystem Dict User Dict Server DictIdleTime Dictionary Status DictDfltkIdleArry needflush Nonstandard definitions Examples of nonstandard definitions Printer resolution and resolution enhancementAppearance consistency Statusdict UserdictDpi image Printed on a 300 dpi printer Printer imaging characteristics Font consistency Proprietary PostScript extensionsControl-Z and superfluous errors Control-D as binary data and end-of-jobSolution to control-Z and control-D problems Multiple jobs in one input file DocuPrint NPS implementation of PostScript Level Simulated mixed plexScan conversion details Printer Controller operationsStroke Fill ShapesCurved shapes Zero-width lines strokesImages Image quality Rendering of color and gray values transfer function PostScript printer description PPD files Implementation limitsImplementation limits File operators and standard devicesQuantity Limit Description SetCacheDevice Path limitsPostScript VM limits Device orientation and setscreen operatorObsolete operators-banddevice, framedevice, renderbands PostScript storage object size limitsArc to Bezier conversion-pathforall Print performance related to image printing Creating the necessary PostScript Ccitt Group 3Scan order and rotation Purpose Image orientation mismatch aImage orientation mismatch B 10.Image pixel sequence example Considerations SummaryScan resolution and scaling 11.Scaling and resolution example12.PostScript with embedded image normal scan order MaxX exch def /minY exch def /minX exch def 14.Actual PostScript print Page Vipp Functionality Operating environmentVipp line mode extension XGFNub Page Symbols CcittIndex 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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