Kyocera TASKalfa 4551ci Printing System (11),(12),(13),(14) Color Reference G - Page 68

Halftone and continuous tone devices, Using color effectively

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DESKTOP COLOR PRIMER 68 With the Color Server, you simply print the file. The Color Server processes the PostScript information in the file and sends four bitmaps (one each for cyan, magenta, yellow, and black) to the printer. The ease of Color Server printing makes possible experimentation that would be too costly on a press, allowing unlimited fine-tuning of color and design elements. Halftone and continuous tone devices Halftoning is used in offset printing to print each process color at a different intensity, allowing millions of different colors to be reproduced using only the four process colors. Depending on the required intensity of a given color, toner is placed on paper in dots of different size. The grid of dots used for each toner color is called a screen. Halftone screens are aligned to unique angles designed to eliminate interference patterns called moiré that can arise with halftoning. Some color printers are commonly referred to as continuous tone (contone) devices. They do not use traditional halftone patterns and angles. Contone devices are capable of varying the intensity of individual dots. Even if your color printing is done exclusively on the Color Server, you will encounter concepts from offset printing if you use high-end graphics applications. For example, color controls in illustration applications, such as Adobe Illustrator, are geared toward specifying color for offset printing using process and spot colors. Many applications allow you to specify the halftone used for each printing plate. Using color effectively The ability to print in color can greatly increase the effectiveness of your message, whether you are printing a presentation or newsletter (short-run printing), or proofing an ad concept that will later be printed on a press (color proofing). Some potential benefits of using color include: • Conveying information rapidly by using color cues • Making use of the emotive aspects of different colors • Increasing impact and message retention Color can also be a source of distraction and discord if it is used poorly. This section outlines some guidelines and concepts to consider as you approach designing color materials.

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D
ESKTOP
C
OLOR
P
RIMER
68
With the Color Server, you simply print the file. The Color Server processes the PostScript
information in the file and sends four bitmaps (one each for cyan, magenta, yellow, and black)
to the printer. The ease of Color Server printing makes possible experimentation that would
be too costly on a press, allowing unlimited fine-tuning of color and design elements.
Halftone and continuous tone devices
Halftoning is used in offset printing to print each process color at a different intensity,
allowing millions of different colors to be reproduced using only the four process colors.
Depending on the required intensity of a given color, toner is placed on paper in dots of
different size. The grid of dots used for each toner color is called a screen. Halftone screens are
aligned to unique angles designed to eliminate interference patterns called
moiré
that can arise
with halftoning.
Some color printers are commonly referred to as
continuous tone (contone)
devices. They do
not use traditional halftone patterns and angles. Contone devices are capable of varying the
intensity of individual dots.
Even if your color printing is done exclusively on the Color Server, you will encounter
concepts from offset printing if you use high-end graphics applications. For example, color
controls in illustration applications, such as Adobe Illustrator, are geared toward specifying
color for offset printing using process and spot colors. Many applications allow you to specify
the halftone used for each printing plate.
Using color effectively
The ability to print in color can greatly increase the effectiveness of your message, whether
you are printing a presentation or newsletter (short-run printing), or proofing an ad concept
that will later be printed on a press (color proofing). Some potential benefits of using color
include:
•
Conveying information rapidly by using color cues
•
Making use of the emotive aspects of different colors
•
Increasing impact and message retention
Color can also be a source of distraction and discord if it is used poorly. This section outlines
some guidelines and concepts to consider as you approach designing color materials.