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The Zoom subform gives the user the ability to zoom in on an entire 
image or on a selected region of the image.  The zoom function 
is accomplished via pixel replication.  
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The Zoom Window
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The Zoom Window, located at the bottom of the Zoom Subform, 
will display the portion of the displayed image
over which the mouse cursor is centered.  The zoom window itself can be 
treated as a regular X window, which allows the user to zoom in on 
a larger portion of an image than will fit in the original zoom window 
by simply resizing the zoom window.
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Update Mode
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The Zooming function may be operated in two modes: Continous or Button Press.
When the update mode is Continuous, the zoom window is continually updated
according to the cursor position in the displayed image.  When the update
mode is Button Press, the zoom window does not update until the mouse is clicked
within the displayed image.
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Changing Zoom Factor
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To change the zoom factor, place the mouse cursor in the zoomfactor parameter
box and enter the new zoom factor (a "^" will indicate the position of the 
cursor - this can be changed by re-positioning the mouse cursor and clicking).  
After the desired zoom factor is entered, hitting the <cr> key will update
the zoom factor, and the image in the zoom window will now be magnified 
by the new zoom factor.  Warning:  Since zoom works via pixel replication, 
zooming by a factor of less than one will may ambiguous results.
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Zoom Window Cursor
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The zoom window, by default, has a "dummy" cursor displayed that reflects the
position of the actual cursor in the displayed image.  This default zoom
window cursor appears as a large "+" sign.  The other dummy cursor that is
available for the zoom window is smaller, and shaped like a box.  Depending
on the characteristics of the image that is currently displayed, one or the
other of the available dummy cursors may be more appropriate.  Alternatively,
some users may not want the dummy" cursor to be displayed at all.  The
"Zoom Window Cursor" option is a cyclic option:  the first click will change
the dummy cursor from the large "+" to the small box;   the second click  will
turn the dummy cursor off; and the third click will turn the dummy cursor back
on, in the large "+" shape.  After this, the cycle will repeat.
