Epson ES-600C Guía de usuario descargar pdf (Pagina 73)

Halftoning mode

Halftoning is a process of changing an image to a pattern of

dots. This is required because a printing press produces images

in a different way than photography does.

Photographs have an almost infinite number of tones, with an

almost infinite number of colors for color photographs, but

printing uses only individual single-color dots. Black and white

images use black dots, and color images use only four colors of

dots: cyan (blue), magenta (red), yellow, and black. The size

and spacing of these dots is varied to simulate photographic

continuous tones. In some halftoning the dots are quite

noticeable, as you can see in the illustration on page 3-7 of this

manual. If the dots are fine enough, however, the printed image

appears to have continuous tones, as you can see on pages 16

and 18 of the Color Image Scanner booklet.

You can choose various types of halftoning at the time you

scan, but it is nearly always best to choose halftoning of “off” or

“none” and have the halftoning done by the image editing

software or by the output device (such as a laser printer). The

illustration on page 3-7 was scanned in color with no halftoning

and printed on a black and white laser printer. The printer

performed the halftoning so that it could print the image. You

can see the dots in the illustration.

You will always get better results scanning from a photograph

than from a printed image, such as a picture in a newspaper or

magazine, because printed images have already been halftoned

and you may see a conflict in the halftone methods. Therefore,

you should not scan the color images in the Color Image Sumner

booklet; use black and white or color photographs for better

test results.

Appendix A-9

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Epson ES-600C Guía de usuario Pagina 73