Operation Manual

Preparing files for print service providers | 615
You can also change the position of printers’ marks by clicking a printers’ mark icon in the print preview window and dragging the
bounding box.
If you want to affix printers’ marks to the object’s bounding box instead of to the page bounding box, click File Print, click the
Prepress tab, and enable the Marks to objects check box.
Maintaining OPI links
Open Prepress Interface (OPI) lets you use low-resolution images as placeholders for the high-resolution images that appear in your
final work. When a print service provider receives your file, the OPI server substitutes the high-resolution images for the low-resolution
placeholders.
To maintain OPI links
1
Click File Print.
2 Click the PostScript tab.
3 Enable the Maintain OPI links check box.
The Maintain OPI links option is available for PostScript devices only.
You can reduce your work time by using OPI and print management server solutions, such as Creo Color Central. Low-resolution
samples are automatically created from the high-resolution originals and are placed in CorelDRAW. These files contain their own OPI
comments, which the Creo Color Central server recognizes when it receives the job and then substitutes the high-resolution version of
the file for the low-resolution version.
Low-resolution images must be flagged as OPI images (this must be done using third-party software) before you can import them
into a document.
Printing color separations
When you send color work to a print service provider or printing shop, either you or the print service provider must create color separations.
Color separations are necessary because a typical printing press applies only one color of ink at a time to a sheet of paper. You can specify
the color separations to print, including the order in which they print.
Printing presses produce color using either process color or spot color, or both. You can convert the spot colors to process colors at printing
time. For more information on spot and process colors, see “Choosing colors” on page 284.
When setting halftone screens to print color separations, we recommend that you use the default settings; otherwise, screens can be
improperly set and result in undesirable moiré patterns and poor color reproduction. However, if you are using an imagesetter, the screen
technology should be set to match the type of imagesetter the print service provider uses. Before customizing a halftone screen, consult the
print service provider to determine the correct setting.
If you have overprinted areas, you can choose how you want those areas to print. For more information about overprinting, see “Working
with color trapping and overprinting” on page 616.
To print color separations
1
Click File Print.
2 Click the Color tab.