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more detail than can be reproduced onscreen or in print. Since JPEG eliminates data, it
can achieve much smaller file sizes than Flate compression. Select Auto to let the applic-
ation choose the best compression method automatically. Note that configurations that
were created with an earlier version of PReS Workflow and that included tasks set not to
use any compression will by default be set to use the Flate compression method.
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Grayscale down sampling: Select the down sampling option. down sampling reduces
image size by breaking images down into small areas in which multiple pixels are replaced
by single pixels. The Grayscale resolution you enter in the following box is used to control
the down sampling process. Select None to prevent grayscale down sampling . Select Aver-
age to average pixel shades in each sample area and to replace the entire area with a pixel
of the average shade. Select Subsample to use a pixel in the center of the sample area and
replace the entire area with that pixel value. This method is significantly faster, but results
in images that are less smooth. Select Bicubic to use a weighted average to determine
pixel shades. This method is the slowest but most precise and results in the smoothest
tonal gradations.
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Grayscale resolution: Select the resolution to use for grayscale images. Note that this set-
ting has an impact on the grayscale down sampling process.
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Color images group
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Color compression: Select the compression to use for the color images. Flate is a
lossless compression method, so no data is lost in the process. It works well on images
with large areas of single shades or repeating patterns, such as screen shots and simple
images created with paint or drawing programs. JPEG removes image data and may
reduce image quality, but may be suitable for continuous-tone photographs containing
more detail than can be reproduced onscreen or in print. Since JPEG eliminates data, it
can achieve much smaller file sizes than Flate compression. Select Auto to let the applic-
ation choose the best compression method automatically. Note that configurations that
were created with an earlier version of PReS Workflow and that included tasks set not to
use any compression will by default be set to use the Flate compression method.
l
Color down sampling: Select the down sampling option. down sampling reduces image
size by breaking images down into small areas in which multiple pixels are replaced by
single pixels. The Color resolution you enter in the following box is used to control the
down sampling process. Select None to prevent grayscale down sampling. Select Average
to average pixel color in each sample area and to replace the entire area with a pixel of the
average color. Select Subsample to use a pixel in the center of the sample area and
replace the entire area with that pixel value. This method is significantly faster, but results
in images that are less smooth. Select Bicubic to use a weighted average to determine
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