Xerox 4890 Advanced Product Reference - page 15

LPS FUNDAMENTALS

Acquiring and loading fonts

The 4890 LPS has a set of standard fonts and a variety of variable

fonts available in Data Center and Interpress character

collections.  For information on acquiring optional fonts, refer to

the ordering information in the back of this book. 

Loading fonts for PostScript applications

The 4890 LPS supports the use of PostScript applications through

a front end processor.  This front end processor converts the

PostScript data stream into Xerox .IMG files.  Since .IMG files are

raster images, they can be printed without calling out any printer

font files.

While it is not necessary to load printer fonts to print PostScript

jobs, it is necessary to load each PostScript font called for in the

document onto the front end.  This allows the front end to map

each PostScript character correctly as it builds the .IMG files for

printing.

Font metrics

Font metrics contain information on the dimensions of each

character in a printer font.  Whenever a new printer font is

installed on the 4890, it is important to load the metrics for that

font onto the host or workstation.  Then, every time that font is

called for in a document, the host or workstation application is

able to access the metrics and format the document using the

metric information.

The .FNT files on each font tape contain the metric information,

along with other information about the font.  From the host, the

system programmer runs a utility to extract the metrics from the

.FNT file and store them on the host.  A name is assigned to the

font, and when you call out the assigned font in your

documents, the metrics file is accessed.

The exact method for extracting the metrics depends upon the

application software in use.  Instructions for metric extraction

should be included with your application software.  Further

information can be found in the Xerox 4850/4890 HighLight

Color and 4135 LPS Font User Guide, or may be obtained from

Xerox Font Services.  Refer to the card in this back of the book

for ordering information.

LPS production process overview

The 4890 works effectively in many different environments

handling input from a wide variety of sources.  

Whether you are using the 4890 in an offline capacity, over an

Ethernet network, connected directly to a host computer, or

remotely over phone lines, input data for printing is sent to the

printer in one of two forms:

•

Unformatted data. In this instance, unformatted data (data

from a computer file in database format) is selected,

formatted, and combined with form data (boxes, lines,

XEROX 4890 HIGHLIGHT COLOR LPS PRODUCT REFERENCE

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