Xerox 721 User Manual - Background Suppression

48  

• Image Quality 

 XEROX WIDE FORMAT COPY SYSTEM  

Background Suppression 

The Background Suppression enables you to make adjustments for 

documents that contain poor contrast between the foreground image and 

the background. Background Suppression monitors the pre-scan 

image, to ensure the best image quality possible. In the PRODUCTIVITY 

mode, there is no prescan, therefore Background Suppression is done 

while the document is being scanned. 

NOTE: The scan system uses the first few inches of a document to 

determine the background suppression.  If the first few inches of the 

document being scanned are not representative of the entire document, 

either too much or too little of the background will be removed.  If this 

occurs, try physically turning the document 90 degrees and scan it again.  

Continue with this until an edge is found that produces a good scan. 

Four choices are provided: 

NOTE: Off is the only choice for Photo and Color Scanning. Scanning 

low contrast documents with background suppression OFF will produce 

washed out images.  When scanning these documents, background 

suppression should be set to AUTO or DARK. 

Off

This setting disables Background Suppression.  It produces a 

document that reproduces all the characteristics of the original 

document with minimum alteration.  Choose this selection when: 

•  The lead edge of the document is very different from the rest 

of the document (e.g., the lead edge contains a black border).   

•  Maps with grayscale or color content may copy best in this 

mode. 

•  To retain more light color information such as light gray or 

yellow. 

     (Light)  This setting works best for documents on translucent or 

transparent media, such as vellum (tracing paper) or film, or with 

medium levels of colored background on opaque media or for 

documents.  Such documents have a higher contrast between the 

foreground and background than dark documents, but less 

contrast than normal documents. 

     (Dark)  Use this setting for documents with a dark background or 

with medium contrast between the foreground and background.  In 

this mode, the background is not suppressed, but the foreground 

image is improved to increase the contrast. 

Auto

  (factory default) - The Scan System automatically adjusts the 

image quality parameters to obtain the best copy. 

NOTE: All three Background Suppression settings can be adjusted 

further by changing the contrast setting in the Image Quality, Copy 

area.