Adobe Acrobat 7 Professional - Manual (Page 509)

Using Scanned Pages settings
The Scanned Pages panel of the PDF Optimizer lets you optimize compression of page regions based on color
content, balancing file size with image quality, and apply filters. If the Optimize Compression Of Page Regions
Based On Color Content option is selected, options in the Images panel are not available; however, a variety of
filters can be applied.
Use the slider to set the balance between file size and image quality. For information on the Deskew, Background
Removal, Edge Shadow Removal, Despeckle, Descreen, and Halo Removal options, see
Using Image Settings
options .
Apply compression based on color content, and then apply filters.