8.4

tasks set not to use any compression will by default be set to use the Flate compression method.
l Monochrome resolution: Select the resolution to use for monochrome images.
l Grayscale images group
l Grayscale compression: Select the compression to use for the grayscale 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 application 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 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 Average 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.
l Grayscale resolution: Select the resolution to use for grayscale images. Note that this setting has
an impact on the grayscale down sampling process.
l Color images group
l 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 application 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.