a method of processing an image includes the steps of receiving selection of the first region of interest of an image , processing the first image data related to the first roi , displaying the first image roi based on the first image data , receiving selection of the second roi of the image , which at least partially overlapping the first roi , processing the second image data related to a portion of the second roi that does not overlap the first roi , combining the processed second image data with the processed first image data that overlaps the second roi , and displaying the second image roi based on the combined processed second image data and the processed first data .