Canon MultiPASS F20 Software User's Manual page 74

To reduce the view, right-click the mouse pointer on the image.
To move an enlarged image:
If the image is too large to see in its entirety, on the toolbar, click Scroll
and drag the zoomed image to display the appropriate section.
To reverse the tone of an image:
On the toolbar, click Negative/Positive.
To create a mirrored view of your image:
On the toolbar, click Flip.
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To rotate the image 90 left or right:
On the toolbar, click Rotate Left or Rotate Right to change the orientation
of the image.
To display rulers in the preview area:
On the toolbar, click Rulers to work more precisely with a preview image,
by displaying rulers on the top and left borders of the preview area.
To remove the current preview image:
Click Clear if the preview image does not serve your purpose.
To reduce the moire pattern in the preview image:
In Advanced Mode, on the F20 tab, click Descreen.
It is only effective for images which are a color or grayscale picture type
and which are less than 600 dpi.
If you are scanning at a higher resolution, the descreen process may take
several minutes to complete.
If moire does not disappear even if you have selected Descreen, try
turning off Unsharpmask.
To sharpen the outline of an image:
In Advanced Mode, click Unsharpmask in the F20 tab.
Select to sharpen an image in a natural way without changing the
brightness and contrast, or hue of an image.
Photos with a soft focus can also be sharpened.
It is only effective for images which are a color or grayscale picture type.
Chapter 4 Scanning 70