Xerox DocuPrint Network Printer Series Guide Manual

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Xerox DocuPrint Network Printer Series Guide Manual Manual pdf 47 page image

POSTSCRIPTXEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES 2-21— The resolution of the source image (sample image) is lowerthan the device space, and the scaling of source-image-to-device space is an integer multiple and rotation is inmultiples of 90 degrees.• Scan Conversion paints any pixel whose square regionintersects the shape if the resolution of the source image islower than that of device space, and the scaling betweensource image and device space is not an integer multiple.This effect is noticeable when you are printing a sampled image witha resolution of less than 600 dpi on the printer at 600 dpi.Image qualityDocuPrint NPS output is superior to that of other printers that use“write-black” technology in the following areas:• 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 printdensity settings and line placement on the page, Xerox cannotguarantee the quality of these single-pixel lines. Specific questionsregarding single-pixel line printing for your application should bedirected to your Xerox service engineer.Some user-defined fonts use either outlines or bitmaps that are tunedto write-black printers. As a result, these fonts appear light on theXerox DocuPrint printers. Character rasterization for fonts that usePostScript painting operators is subject to the scan conversion rulesdescribed 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, unlessthe creator has followed the standards suggested in the PostScriptreference manual and specified the fonts used by the document in aPostScript 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 tocertain graphics-rendering operations. For example, outline fonts inthe Type 1 format are subject to rasterization techniques that usethickening for best quality of text rendering on Xerox devices.