QMS 4060 Technical Information download pdf (Page 146)

Halftones

QMS 4060 Print System Reference5-4

Configuring the printer through the control panel is described in chap-

ter 4, “Printer Configuration,” of this manual.

Halftones

The ability of the printer to produce halftones allows you to add

scanned images or halftone graphics to your documents. This section

will explain some of the options available on the QMS 4060 for half-

tone printing.

What are Halftones?

Continuous tone scanned images have to be converted to dot pattern

images on a laser printer. Laser printers, like printing presses, only

have the ability to print patterns of dots controlled by turning on and

off the laser. Because of the limited resolving power of the eye half-

tones appear as continuous tone images. For an example hold a

newspaper photograph very close to your eyes to see the halftone

dots.

Halftone characteristics can be changed by settings available on your

QMS 4060 Print System. The following factors can be used to adjust

the halftone characteristics of your documents.

n Printer resolution

n Screen frequency and screen angles (Halftone types)

There can be some side effects to changing these factors. Factors

such as the number of gray levels, printer performance, and scanned

image quality can be affected.

Gray Levels

Gray levels are a progressive series of gray tones between black and

white. Gray levels are produced by varying the ratio of black to white

halftone dots. The number of gray levels depends on printer resolu-

tion and screen frequency.

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QMS 4060 Technical Information Page 146