Image Differentiation Style string
  
  
Description
				Specifies a style of image differentiation (i.e. the main
    algorithm to use) 
				Values
				
					
						
							| Value | 
							Description | 
						 
						
							| difference | 
							Computes numerical distance between colours
          components | 
						 
						
							| blank-similar | 
							Blends pixels with similar colours components
          with blanking colour. The more similar the nearer from
          blanking colour | 
						 
					
				 
				  
			
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