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Image Arithmetic

AVERAGE/AVERAGE 		 Compute simple average of all pixels in a subimage 
AVERAGE/COLUMN Compute average of image columns
AVERAGE/IMAGE Calculate the average of images
AVERAGE/ROW Compute average of image rows
AVERAGE/WINDOW Compare images, then take the meaning
COMPUTE/COLUMN Perform arithmetic expression on image column
COMPUTE/IMAGE Compute arithmetic expression of images
COMPUTE/PIXEL Perform arithmetic operations on images using
pixel coordinates
COMPUTE/ROW Compute arithmetic expression on image scan lines
COMPUTE/..PLANE Do arithmatic on planes of a data cube