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Transformations on Pixel Values

FIT/FLAT_SKY 		 Correct an image for sky variations 
ITF/IMAGE Transform pixel values in an image
MODIFY/AREA Remove bad pixel from circular area
MODIFY/CURSOR Change pixel values in image by cursor
MODIFY/GCURSOR Change pixel values in image by graphic cursor
MODIFY/PIXEL Change pixel values in image
REPLACE/IMAGE Modify pixel values in given intensity interval
REPLACE/POLYGON Replace pixel values inside a polygon