Epson ES-1200C Guide de l'utilisateur télécharger pdf (Page 37)

Electronic color printers use laser, ink jet, or other

technologies to produce color or gray scale images that

range from coarsely patterned to nearly photographic

(often called continuous tone) quality. It is best to see

samples from a color printer before you decide to use it.

These printers are usually used for small quantities of color

images or for preliminary proofs of images that will be

printed on a printing press.

File size

Printing presses are for high quality and high volume work.

You scan and edit your images and then send the files to a

service bureau or printing company, which uses high

resolution phototypesetters (also called imagesetters) for

high quality text and gray-scale images. For full-color

images, you scan in color and then use your image editing

software to manipulate the image and produce color

separation files. If you plan to do this, see the guidelines

below on resolution and then follow the instructions in

your software manual for making separations. Your service

bureau or printing company should also provide helpful

information.

Computer screens require lower resolutions than most

printers. If your scanned image will be viewed only on a

computer monitor or screen and will never be printed,

you can use lower scanning resolutions for top-quality

work. Remember that the scanner can read and save up to

16 million colors. If your computer can display only 16 or

256 colors, you will not be able to see all of the quality of

the scanned image.

In gray scale and color, use the lowest resolution that gives

acceptable quality for your printing or display method because

high resolutions mean large files. An A4 or letter-size full-color

scan at 300 dpi uses as much as 25 megabytes (MB) of disk

space.

2-12 Scanner Basics

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Epson ES-1200C Guide de l'utilisateur Page 37