Xerox 4090 IPS manual Device-dependent operators, Gray shading-setscreen and setcolorscreen

Page 54

Optimizing print quality

Device-dependent operators

Some PostScript operators result in device-dependent PostScript files. “Device dependence” means that devices having different output characteristics may produce different-looking output even though they use the same software. This section documents the most serious examples of device dependence. The PostScript Language Reference Manual, second edition, lists all of the graphics state operators that are considered device-dependent.

Gray shading—setscreen and setcolorscreen

The PostScript operators setscreen and setcolorscreen control the PostScript halftone software that simulates various intensity levels of gray and color inks. Since each PostScript product may have a different default halftone definition, the halftone patterns and gray scale range may differ also. Because setscreen is inherently device dependent (especially when used for pattern fills), PostScript masters look different on almost every different model of PostScript printer.

The operators are also used to perform pattern fills, since PostScript Level 1 does not have a pattern fill operator. (PostScript Level 2 has pattern fill operators.) As stated in the PostScript Language Reference Manual, first edition, “Remember that everything pertaining to halftones is, by definition, device-dependent. In general, when an application provides its own halftone specifications, it sacrifices portability. Associated with every device is a default halftone definition that is appropriate for most applications.”

In addition to the device-dependent nature of halftoning, a spot function is used by setscreen and setcolorscreen to determine the order of pixel darkening in the halftone cell. When two pixels have the same spot function value, their ordering values are determined arbitrarily. Duplicate spot function values are very common. In fact, almost all the various default spot functions generate duplicate values. Therefore, different PostScript implementations yield different halftone patterns, resulting in visual differences in the output.

5-2

Troubleshooting Guide

Page 53 Page 55
Image 54
Page 53 Page 55
Contents Xerox DocuPrint 4050/4090 NPS/IPS 721P90231 Version 8.0 OctoberPage Table of contents Resolving printer problems Resolving system problems Optimizing print qualitySafety Laser safetyOperation safety U. S Ozone information U. S. onlyOperation safety Europe Operator accessible areas Electrical supplyVentilation Maintenance Before cleaning your productCE mark Europe only Radio and telecommunications equipment directive Europe only For further information Safety Xii Troubleshooting Guide Contents IntroductionAbout this guide Conventions Related publications Introduction Calling for service Information to have on hand when calling for serviceEnabling and disabling the modem for remote service Troubleshooting Xerox Client Software installation Xerox Client Software installation error messages Error message DescriptionTroubleshooting a Novell implementation Pserver problems Problem Probable Cause ResolutionTroubleshooting a Novell implementation PASSWORDS=ON at the serverRprinter problems Problem Probable Cause Resolution Page Clearing a feeder tray fault Clearing paper misfeeds and jamsPage Page Frequent misfeeds Page Clearing paper jams Areas along the simplex paper pathMessage and graphic displays on printer console Job recovery Checking job integrity following a paper jam Message labels inside the printerPrinter jam clearance areas Remove and discard any paper you find in the areas indicated Clearing paper jams from areas 2 and 2A Page Page Clearing paper jams from area Page Follow these steps to clear jams from area Clearing paper misfeeds and jams Clearing paper jams from area Page Clearing paper jams from areas 6 and 6A Clearing paper jams from area Page Page Clearing paper jams from area Page Clearing stitcher/stacker paper jams areas a and B Adjusting dual stacker tray scuffer arms Adjusting scuffer arm weights Product features that affect PostScript print quality Optimizing print qualityProprietary PostScript extensions Device-dependent operators Gray shading-setscreen and setcolorscreenGray shading-settransfer and transfer function Settransfer, or SetcolortransferSmooth curves-setflat Invisible strokes-0 setlinewidthScan conversion-fill, eofill, and stroke Resolving printer problems Symptom Probable cause ActionResolving printer problems Resolving system problems Set Scheduling Policy to Enter Start Queueing or PrintingEnter Show Scheduling Policy to Enter Print Sample Document to see ifEnter Show Document Attributes Document Attributes to specify desiredEnter Show Document Attributes to Enter Start Queueing Enter List Virtual Printer or Show IpdsEnter Start Virtual Printer vpname Enter Start Printing or Start IpdsIndex INDEX-1INDEX-2 INDEX-3 INDEX-4
Related manuals
Manual 128 pages 55.36 Kb

4090 IPS specifications

The Xerox 4090 IPS and the Xerox 4050 IPS are two of the most advanced digital printing solutions offered by Xerox, catering to the needs of high-volume printing environments. Both models are designed to enhance productivity and deliver exceptional print quality, making them ideal for commercial printing houses, universities, and corporate environments.

The Xerox 4090 IPS, for instance, boasts a robust design capable of handling large print jobs with ease. Its standout feature is its high-speed printing capability, reaching up to 90 pages per minute. This speed is complemented by the advanced imaging technology that guarantees sharp text and vibrant images. The 4090 IPS utilizes a laser printing mechanism, which contributes to its ability to produce fine detail and consistency across various media.

On the other hand, the Xerox 4050 IPS offers slightly lower speed at 50 pages per minute but compensates with additional versatility. It supports a diverse range of media types, including heavy cardstock, envelopes, and labels, making it a perfect choice for businesses requiring varied print outputs. Both models feature a powerful processor and an extensive memory capacity, ensuring seamless print processing even for complex documents loaded with graphics and images.

Both printers come equipped with Xerox’s Intelligent Print System (IPS) technologies, which optimize print workflows for efficiency and manageability. This system allows for easy integration into existing network environments and supports various file formats, enhancing compatibility across different platforms. In addition, the user-friendly interface and touchscreen control panel simplify navigation and job management.

Security features are also a priority in both models. They include secure print functionalities and options for user authentication, ensuring that sensitive information remains protected during the printing process.

In summary, the Xerox 4090 IPS and 4050 IPS deliver outstanding performance through their high-speed printing, exceptional print quality, and adaptability to various media types. Coupled with innovative technologies designed for efficiency and security, these printers are well-suited for organizations needing reliable and high-quality printing solutions. Overall, both the 4090 IPS and 4050 IPS represent a significant advancement in digital printing technology, setting a high standard in the industry.
Top Page Image Contents