2.PostScript

This chapter provides an overview of standard PostScript operations and guidelines for ensuring consistent printer output.

Implementation-dependent operations

The following operations are implementation-dependent.

Floating-point arithmetic and math operators

All PostScript floating-point arithmetic and math operators are implementation-dependent if you use very large or very small floating-point numbers. This is rarely a problem with PostScript masters generated by “real world” creators; that is, commercial PostScript creators such as Word or Excel. Handwritten test masters, however, can cause problems.

Some handwritten test masters print out the limits of floating point numbers and various floating-point operations. Because these values may vary based on the PostScript implementation, the test master output also varies, making these tests useless for testing consistency across different PostScript printers.

Coordinate system default matrix

The PostScript current transformation matrix (CTM) controls the mapping of user coordinates to device coordinates. You can describe pages in your own coordinate system and let the PostScript software transform your requests into the device space. PostScript masters are device independent only when they do not use the actual CTM values. When a master needs CTM values, it becomes device- dependent. The occasional need for CTM values causes inconsistent output across different PostScript printers.

Some handwritten test masters print out CTM values. Since these values vary, depending on the device resolution and positioning, the test master output also varies, making these tests useless for consistency testing across different PostScript printers.

XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES

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Xerox 721P87491 manual Implementation-dependent operations, Floating-point arithmetic and math operators

721P87491 specifications

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