Adobe illustrator 10 Manuale Utente
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Adobe Illustrator Help
Producing Color Separations
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If you use the Overprint option on a 100% black stroke or fill, the black ink may not be
opaque enough to prevent the underlying ink colors from showing through. To eliminate
the show-through problem, use a four-color (rich) black instead of a 100% black. Consult
with your print shop about the exact percentages of color to add to the black.
opaque enough to prevent the underlying ink colors from showing through. To eliminate
the show-through problem, use a four-color (rich) black instead of a 100% black. Consult
with your print shop about the exact percentages of color to add to the black.
Appearance of artwork on monitor and printed artwork
To set or remove overprinting from black lines:
1 Select the objects to have overprinting added or removed. You can set overprinting for
custom colors whose process equivalents contain specific percentages of black or for
process colors that include black.
custom colors whose process equivalents contain specific percentages of black or for
process colors that include black.
2 Choose Filter > Colors > Overprint Black.
3 In the dialog box, choose Add Black to add overprinting or Remove Black to remove
overprinting commands.
overprinting commands.
4 Enter the percentage of black to indicate which objects have overprinting added or
removed. For example, enter 80% to select only objects containing 80% black.
removed. For example, enter 80% to select only objects containing 80% black.
5 Choose any of the following options:
•
Fill, Stroke, or both options to apply overprinting to filled paths, stroked paths, or both
types of paths.
•
Include Blacks with CMY to apply overprinting to paths painted with cyan, magenta, or
yellow if the path also contains black at the specified percentage.
•
Include Spot Blacks to apply overprinting to custom colors whose process equivalents
include black at the specified percentage.
Note: If you are overprinting a spot color that contains process colors as well as the
specified percentage of black, it is necessary to choose both the Include Blacks with CMY
option and the Include Spot Blacks option.
specified percentage of black, it is necessary to choose both the Include Blacks with CMY
option and the Include Spot Blacks option.
6 Click OK.
Step 3: Create a trap to compensate for misregistration on
press
press
Misregistration can cause gaps between colors on the final output when colors printed
from separate plates overlap or adjoin one another. To compensate for potential gaps
between colors in artwork, print shops use a technique called trapping to create a small
area of overlap (called a trap) between two adjoining colors.
from separate plates overlap or adjoin one another. To compensate for potential gaps
between colors in artwork, print shops use a technique called trapping to create a small
area of overlap (called a trap) between two adjoining colors.