Here is a variation of the theme using the GRAY SCALE & VALUE FINDER. 
 
I worked up the white patch (upper left in the scale) to as accurate a tone as my system will allow.  This one works very accurately as well. 
 
Norm D
		 
		
		
		
			
		
		
		
		
		
		
			
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				Norm Dunne 
 
I love the Old Masters for incentive and compositional ideas.
			 
		
		
		
		
		
	
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