Parent Topic: <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/CLWORKS|Class+Editing">Class Editing</a><hr>
<H4>Mask Generation</H4>
The Mask Generation area is used to draw the mask under which the class 
editing
operations are performed. Mask drawing is done over a full resolution 
subset of the reference or classified image, loaded by the Load Full
Resolution Area panel.<p>
The Modify Colour button in the Mask Generation area opens the Class Colour
Selection panel, used to select the colour of the mask. The default colour 
is white. A small square to the left of the Modify Colour button shows the 
current colour of the mask.<p>
An option menu selects the mode for showing the mask:
<P>
<UL>
<LI> Opaque: Mask is solid; image underneath mask cannot be seen. 
<LI> Not Showing: Mask is not seen; image underneath is completely visible.
</UL>
Another option menu selects which image is to be displayed during mask 
generation:
<P>
<UL>
<LI> Reference: Show RGB reference image.
<LI> Classified: Show pseudo-coloured classified image.
<LI> Image Off: Do not show either image.
</UL>
Function buttons inside the Mask Generation area are used to 
draw the mask border and fill it:
<P>
<UL>
<LI> Clear Mask: Clears (erases) the whole mask. 
<LI> Trace&amp;Close: Traces the mask border while the mouse button is pressed
down, then closes the traced mask when the mouse button is released. 
<LI> Draw Polygon: Draws line segments each time the mouse button is pressed. 
<LI> Close Polygon: Closes the most recent polygon drawn by Draw Polygon. 
<LI> Fill: Fills the area clicked by the mouse.
<LI> Unfill: Unfills (erases) the area clicked by the mouse. 
</UL>
<hr>
Parent Topic: <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/CLWORKS|Class+Editing">Class Editing</a><br>
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