FIT/FLAT_SKY Correct an image for sky variationsITF/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