Xerox 350 用户手册

Tektronix halftone screens are designed for Tektronix printers, and improve 
print quality over application-set halftone screens.  The Setscreen Off 
(SCRENOFF.PS) utility file redefines some PostScript operators, such as the 
setscreen, setcolorscreen and sethalftone.  By default, the printer prevents 
applications from overriding the Tektronix proprietary halftone screens.  
Use the following utility files, depending on your computer type, to control 
application-defined halftone screens in your prints.         

Refer to “Using the Macintosh Installer” on page 2-53 for 
instructions on installing the utility files from the Phaser 350 
printer’s CD-ROM.

Select the appropriate printer in the Chooser.  

Locate the LaserWriter Utility in the PhaserTools folder on your hard 
disk, and double-click its icon to start the application.  

Choose Download PostScript File from the Utilities menu.  

Select either the Setscreen On or the Setscreen Off file from the list, 
then click Open.  (These files were installed in the Printer Utilities 
folder, inside the PhaserTools folder.) 

At the prompt 

Save PostScript output as:

 you are asked 

for a file name for saving printer output.  Use either the default 
name given in the edit box or type a new name.  Click Save to 
send the file to the printer.

If no output is returned by the printer, the LaserWriter Utility 
displays a dialog box; click OK continue.  

Setscreen On 
Setscreen Off and
LaserWriter Utility

SCRENON.PS
SCRENOFF.PS