Operation Manual

C OREL PDF F USION U SER G UIDE
SETUPS INDEX CONTENTS  117 
PDF DOCUMENT SETUP INDEX CONTENTS  117 
independent calibrated RGB color space. This produces PDF files which
render more slowly, but whose colors are more constant across
properly set up output devices.
Preserve overprint
When selected, any changes to the PostScript language graphics state
overprint parameter requested by the job are passed though to the PDF
file. This feature, along with Preserve OPI comments, and Under color
removal and black generation information is intended primarily for use
within a pre-press environment.
Preserve under color removal and black generation information
Preserve or remove under-color removal and black generation
information from the PostScript language file. This is normally only used
in pre-press environments.
The following options are available in the Document structuring conventions (DSC)
panel.
Use BoundingBox for
As well as the conventional page size request embedded in the
PostScript language file, many files also contain comments describing the
actual extent of marks on the page. This option lets you: ignore these
comments—by selecting
Nothing ; use the bounding box for the PDF
page size—by selecting
Page Size ; or use the bounding box for the
optional page cropping box—by selecting
Crop box .
Most PDF viewers display pages as if they were the size specified for the
page cropping box. Some applications may generate their own cropping
box information using
pdfmark , which overrides any cropping box set in
this way.
Preserve OPI comments
OPI (Open Prepress Interface) is used to reduce network traffic by
substituting high-resolution images with low-resolution screen images for
the purpose of screen display and page make-up. With this option
selected, OPI comments in the PostScript language input file are
reproduced as OPI dictionaries in the PDF output.
It is not necessary for the high-resolution image data to be available to
Corel PDF Fusion—it passes the file name through to the output. Corel
PDF Fusion produces only an OPI 1.3 dictionary, only an OPI 2.0
dictionary, or both, depending on whether the PostScript language file
input uses one or both versions of the OPI comments.
9.4.3 Compression tab (PDF)
The sections in the Compression tab allow different compression techniques to be
applied to different types of images.