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1-12 Guide to Using Page Description Languages
Appearance consistency
To control the consistency of output between more than one
printer, you must consider the following:
• Printer resolution and resolution enhancement
• Printer imaging characteristics
• Font consistency
• Proprietary Postscript extensions
• Color differences for full color and highlight color printers
The following sections provide guidelines for ensuring
consistency between printers.
Printer resolution and resolution enhancement
The most obvious reason for inconsistent output between two
printing devices is that they have different resolutions. For
example, a 600 by 600 dpi printer has much smoother looking
fonts and curves than a 300 by 300 dpi device. For the same
physical size (constant frequency) of halftone, you get four times
the number of gray levels on a 600 by 600 dpi printer as on a 300
by 300 dpi device. If your document contains scalable fonts or
simple line art generated at 600 dpi, the differences between
printing it at 300 and 600 dpi are subtle.
However, if your document contains bitmaps with a resolution of
600 dpi, printing it at 300 dpi causes a degradation in image
quality. Figure 2-1 provides an example of a 300 dpi image and a
600 dpi image output on a 300 dpi printer. The 600 dpi image
appears larger and in a different position on the page.
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