Adobe illustrator 10 Manuale Utente
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Adobe Illustrator Help
Setting Up Artwork in Illustrator
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Because they use more pixels to represent each unit of area, higher-resolution images
usually reproduce more detail and subtler color transitions than lower-resolution images
when printed. However, increasing the resolution of an image scanned or created at a
lower resolution only spreads the original pixel information across a greater number of
pixels and rarely improves image quality.
usually reproduce more detail and subtler color transitions than lower-resolution images
when printed. However, increasing the resolution of an image scanned or created at a
lower resolution only spreads the original pixel information across a greater number of
pixels and rarely improves image quality.
To determine the image resolution to use, consider the medium of final distribution for
the image. If you’re producing an image for online display, the image resolution only
needs to match the typical monitor resolution (72 or 96 ppi). However, using too low a
resolution for a printed image results in pixelation—output with large, coarse-looking
pixels. Using too high a resolution (pixels smaller than what the output device can
produce) increases the file size and slows the printing of the image.
the image. If you’re producing an image for online display, the image resolution only
needs to match the typical monitor resolution (72 or 96 ppi). However, using too low a
resolution for a printed image results in pixelation—output with large, coarse-looking
pixels. Using too high a resolution (pixels smaller than what the output device can
produce) increases the file size and slows the printing of the image.
Note: The Printing & Export panel of the Document Setup dialog box lets you define the
output resolution for vector drawings. In Illustrator, output resolution refers to the number
of line segments the PostScript
output resolution for vector drawings. In Illustrator, output resolution refers to the number
of line segments the PostScript
®
interpreter uses to approximate a curve (it is not the same
as image resolution). (See
Monitor resolution The number of pixels or dots displayed per unit of length on the
monitor, usually measured in dots per inch (dpi). Monitor resolution depends on the size
of the monitor plus its pixel setting. A PC or Mac OS monitor can range from 60 to 133 dpi.
Understanding monitor resolution helps explain why the display size of an image on-
screen often differs from its printed size.
monitor, usually measured in dots per inch (dpi). Monitor resolution depends on the size
of the monitor plus its pixel setting. A PC or Mac OS monitor can range from 60 to 133 dpi.
Understanding monitor resolution helps explain why the display size of an image on-
screen often differs from its printed size.
Printer resolution The number of ink dots per inch (dpi) produced by an imagesetter or
laser printer. For best results, use an image resolution that is proportional to, but not the
same as, printer resolution. Most laser printers have output resolutions of 600 dpi to
1200 dpi and produce good results with images from 72 ppi to 185 ppi.
laser printer. For best results, use an image resolution that is proportional to, but not the
same as, printer resolution. Most laser printers have output resolutions of 600 dpi to
1200 dpi and produce good results with images from 72 ppi to 185 ppi.
High-end imagesetters can print at 1200 dpi or higher and produce good results with
images from 200 ppi to 350 ppi.
images from 200 ppi to 350 ppi.
Screen frequency The number of printer dots or halftone cells per inch used to print
grayscale images or color separations. Also known as screen ruling or line screen, screen
frequency is measured in lines per inch (lpi)—or lines of cells per inch in a halftone screen.
grayscale images or color separations. Also known as screen ruling or line screen, screen
frequency is measured in lines per inch (lpi)—or lines of cells per inch in a halftone screen.
The relationship between image resolution and screen frequency determines the quality
of detail in the printed image. To produce a halftone image of the highest quality, you
generally use an image resolution that is from 1.5 to at most 2 times the screen frequency.
But with some images and output devices, a lower resolution can produce good results.
of detail in the printed image. To produce a halftone image of the highest quality, you
generally use an image resolution that is from 1.5 to at most 2 times the screen frequency.
But with some images and output devices, a lower resolution can produce good results.
Note: Some imagesetters and 600-dpi laser printers use screening technologies other than
halftoning. If you are printing an image on a nonhalftone printer, consult your service
provider or your printer documentation for the recommended image resolutions.
halftoning. If you are printing an image on a nonhalftone printer, consult your service
provider or your printer documentation for the recommended image resolutions.
About the work area
In Adobe Illustrator, the work area occupies the entire space within the Illustrator window
and includes more than just the printable page containing your artwork. The printable
and non-printable areas are represented by a series of solid and dotted lines between the
outermost edge of the window and the printable area of the page.
and includes more than just the printable page containing your artwork. The printable
and non-printable areas are represented by a series of solid and dotted lines between the
outermost edge of the window and the printable area of the page.
Imageable area The imageable area is bounded by the innermost dotted lines and
represents the portion of the page on which the selected printer can print. Many printers
cannot print to the edge of the paper.
represents the portion of the page on which the selected printer can print. Many printers
cannot print to the edge of the paper.