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Fiery’s Composite Overprint feature enables overprinting only for objects specified to overprint in composite PostScript and PDF files.
Several important feature benefits are a smaller file size for network transfers, honoring of overprint commands specified in source
applications such as QuarkXPress and Adobe InDesign, one-time color management by the RIP and overprinted objects in separated
data that will be overprinted in composite data to match overprint results.
Enable this feature for best results when print jobs contain spot colors that may be overprinted.
CPSI
The Fiery server’s configurable PostScript interpreter (CPSI) can process up to 250 spot colors (including C, M, Y and K) per page when
Composite Overprint is enabled. When Composite overprint is disabled, there is no practical limit. Files set to print PANTONE charts
exceeding 250 colors on a page will show an error message with Composite Overprint on because the file exceeds the limit of supported
colors for overprinting even though the objects are not set to overprint. Turn off Composite Overprint to print these files without an RIP
error.
Fiery servers support overprinting 64 colors (e.g., CMYK plus 60 spot colors) on a page through CPSI. Pages containing more than 64
colors apply knockout to objects filled with the colors that exceed the overprint limit. These colors will be rendered according to the color
definition in Fiery’s spot color library, and if the color definition is missing, the alternate color space is used.
This overprint limit is well in excess of Adobe Creative Suite’s limit of 27 spot colors for overprint preview modes and printing separated
data. Because Fiery supports overprinting for more colors than can be previewed in Adobe design applications, the customer’s documents
will accurately print overprinted objects as they are displayed in native design applications such as InDesign or Acrobat.
Adobe PDF Print Engine
Adobe PDF Print Engine (APPE) supports overprint for at least 31 colors per page (e.g., CMYK plus 27 spot colors) when Composite
Overprint is enabled, though APPE continues to apply overprint to additional colors with a nondeterministic algorithm. A comparison of
printed results from CPSI and APPE with a test file containing 64 overprinting spot colors is expected to show the differences in the way
APPE applies overprint and knockout. If transparent objects are on the page, APPE will not accept a group of overprinted objects that
exceeds 56 colors. APPE also renders spot colors according to the color definitions in the Fiery spot color library; if the definition is
missing, the alternate color space is used.
Fiery servers support Composite Overprint from applications that output PostScript/PDF overprints according to both Adobe and Quark
standards. The system supports files generated by the current versions of these applications:
• Adobe Acrobat
• Adobe Illustrator
• Adobe InDesign
• QuarkXPress
• Corel Draw
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