HP 5400c Series - Manual (Page 59)

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Descreening images
Use the Descreen command to reduce undesirable patterns in printed
items you are scanning. An example of an undesirable pattern is a
moiré pattern, or the circles that often appear on pictures printed in
newspapers.
Note that scanning takes longer when this command is selected. Use
Descreen only when you see undesirable patterns on the scan of a
printed original. When Descreen is turned on or off, a new preview
scan starts and image adjustments are reset.
On the Advanced menu, click Descreen. Select the option again to
turn it off.
Resetting all adjustments
You can reset images to the optimal (default) values the scanning
software chose for the image. Optimal values are based on the output
type selected. Resetting removes all adjustments you have made
except the output type, zoom level, or the selection area.
.
Do one of the following:
l
On the Edit menu, click Reset Tools.
l
On the toolbar, click .