Adobe InDesign CS3 Manual do Utilizador descarregar pdf (Página 548)

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Chapter 20: Printing

To make optimal decisions about printing, you should understand basic printing principles, including how the

resolution of your printer can affect the way your layout appears when printed. Contact your print service provider

to get information on color choices and make the best printing decisions.

Printing documents

About printing

Whether you are providing a multicolored document to an outside service provider, or just sending a quick draft of

a document to an inkjet or laser printer, knowing a few basics about printing will make the print job go more

smoothly, and help to ensure that the finished document appears as intended.

Types of printing

When you print a file, Adobe InDesign CS3 sends it to a printing device—either to be printed directly on paper or

to a digital printing press, or to be converted to a positive or negative image on film. In the latter case, the film can

then be used to create a master plate for printing by a commercial press.

Types of images

The simplest types of images, such as text, use only one color in one level of gray. A more complex image is one with

color tones that vary within the image. This type of image is known as a continuous-tone image. A photograph is an

example of a continuous-tone image.

Halftoning

To create the illusion of continuous tone, images are broken down into a series of dots. This process is called

halftoning. Varying the sizes and densities of the dots in a halftone screen creates the optical illusion of variations of

gray or continuous color in the printed image.

Color separation

Artwork that will be commercially reproduced and that contains more than a single color must be printed on

separate master plates, one for each color. This process is called color separation.

Getting detail

The detail in a printed image results from a combination of resolution and screen frequency. The higher an output

device’s resolution, the finer (higher) the screen frequency you can use.

Duplex printing

Printer-specific features such as duplex printing are available when you click the Printer button in the Print dialog

box. Duplex printing is available only if the printer supports it. For information on duplex printing, see your printer

documentation.

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