Adobe illustrator 10 Manuale Utente
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Adobe Illustrator Help
Producing Color Separations
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Overprinting black in the separation
It can be cheaper and easier to have the print shop overprint black on the press. You can
choose whether to overprint black when printing or saving selected separations.
choose whether to overprint black when printing or saving selected separations.
See
To overprint black in the separation:
1 Under Options in the Separation Setup dialog box, select Overprint Black.
Note: The Overprint Black option works only for objects that have the color black applied
through values in the K channel. It does not work for objects that appear black because of
their transparency settings or styles.
through values in the K channel. It does not work for objects that appear black because of
their transparency settings or styles.
2 Specify another separation option, or click OK.
Specifying the bleed area
Bleed is the amount of artwork that falls outside of the printing bounding box, or outside
the crop marks and trim marks. You can include bleed in your artwork as a margin of
error—to ensure that the ink is still printed to the edge of the page after the page is
trimmed or to ensure that an image can be stripped into a keyline in a document. Once
you create the artwork that extends into the bleed, you can use Illustrator to specify the
extent of the bleed.
the crop marks and trim marks. You can include bleed in your artwork as a margin of
error—to ensure that the ink is still printed to the edge of the page after the page is
trimmed or to ensure that an image can be stripped into a keyline in a document. Once
you create the artwork that extends into the bleed, you can use Illustrator to specify the
extent of the bleed.
Changing the bleed moves the crop marks farther from or closer to the image; the crop
marks still define the same size printing bounding box, however.
marks still define the same size printing bounding box, however.
To specify bleed:
1 Under Options in the Separation Setup dialog box, enter an amount in the Bleed
text box.
text box.
By default, Illustrator applies a bleed of 18 points. This means that the artwork extends
18 points beyond the crop marks on your film. The maximum bleed you can set is
72 points; the minimum bleed is 0 points.
18 points beyond the crop marks on your film. The maximum bleed you can set is
72 points; the minimum bleed is 0 points.
The size of the bleed you use depends on its purpose. A press bleed (that is, an image that
bleeds off the edge of the printed sheet) should be at least 18 points. If the bleed is to
ensure that an image fits a keyline, it needs to be no more than 2 or 3 points. Your print
shop can advise you on the size of the bleed necessary for your particular job.
bleeds off the edge of the printed sheet) should be at least 18 points. If the bleed is to
ensure that an image fits a keyline, it needs to be no more than 2 or 3 points. Your print
shop can advise you on the size of the bleed necessary for your particular job.
2 Specify another separation option, or click OK.
Step 6: Print and save separations
When you have completed setting up the separations, you are ready to print or save your
separations.
separations.
Note: The printer or imagesetter you plan to use to print separations must match the PPD
file you specified when setting up the separations. If the output device and PPD file don’t
match, you will receive a warning message.
file you specified when setting up the separations. If the output device and PPD file don’t
match, you will receive a warning message.
Saving the file saves the separation setup, the PPD information, and any color conversions
you have specified in the Separation Setup dialog box.
you have specified in the Separation Setup dialog box.