In the adjacent list, select a profile.
Multi Channel
NChannel color space is used
PDF Preflight detects whether a PDF file uses NChannel color
spaces.
Image settings in Preflight Editor
Resolution
Resolution of color or grayscale image is below
Determines whether any color or grayscale images in the PDF
file have a lower resolution than the value that you specify. To
change the resolution, type a value in the adjacent box. The
default is 150 dpi.
Resolution of color or grayscale image is above
Determines whether any color or grayscale images in the PDF
file have a higher resolution than the value that you specify. The
default is 300 dpi.
To reduce the resolution, select the
Fix
check box, type a
number in the adjacent box, and select one of the following
settings:
●
Average downsampling
to average the pixels in a sample
area and replace the entire area with average pixel color at
the specified resolution.
●
Bicubic downsampling
to use a weighted average to
determine pixel color. This usually yields better results than
the simple averaging method of downsampling. Bicubic is
the slowest but most precise method, resulting in the
smoothest tonal gradations.
Resolution of B&W images is below
Determines whether any black-and-white images in the PDF file
have a lower resolution than the value that you specify. To
change the resolution, type a value in the adjacent box. The
default is 1200 dpi.
Resolution of B&W images is above
Determines whether any black-and-white images in the PDF file
have a higher resolution than the value that you specify. To
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Chapter 10—Refining
