quality of images. It produces the best results in images that
contain large areas of solid white or black.
●
Not compressed
To use another compression method for color or grayscale
images, select the
Fix
check box and select
JPEG
or
ZIP
. If you
select
JPEG
, select a level of quality from the adjacent list.
Black and white images are
Determines whether the PDF file contains black-and-white
images that are compressed using one or more of the following
methods of the on-screen options. From the
Options
menu,
select one of the following options:
●
JBIG compressed. JBIG compression of bilevel images uses
only one bit to express the color value of each pixel. JBIG
compression does not remove data to reduce the file size, so
it doesn't affect the quality of images.
●
CCITT compressed. CCITT compression is appropriate for
black-and-white images created in paint programs and for
images scanned with an image depth of 1 bit. It does not
remove data to reduce the file size, so it doesn't affect the
quality of images.
●
ZIP compressed
●
LZW compressed
●
Run Length compressed
●
Not compressed
To use another compression method for black-and-white
images, select the
Fix
check box and select
CCITT G4
,
ZIP
, or
Run Length
. CCITT G4 is a general-purpose option that
produces good compression for most types of monochrome
images.
JPEG compression ratio
Detects JPEG images in the PDF file that may have deteriorated
because of a high compression ratio. PDF Preflight looks for
images with a higher compression ratio than the value that you
specify. The default value is 4.
OPI settings in Preflight Editor
OPI
OPI version is incompatible with
Determines whether the PDF file is incompatible with the OPI
version that you specify.
OPI settings in Preflight Editor
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