HP 7400C Series - Manual (Page 49)

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Descreening images
Use the Descreen command to reduce undesirable patterns in printed
items that 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. If you
are not scanning a printed original, turn Descreen off to reduce
scanning time.
To descreen images
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.
To reset all adjustments
Do one of the following:
● On the Edit menu, click Undo Editing Changes.
● On the toolbar, click .