Inthispaper,wepresentanunsharpmasking-basedapproachfornoisesmoothingandedgeenhancinginmultichannelimages.Theproposedstructureissimilartotheconventionalunsharpmaskingstructure,however,theenhancementisallowedonlyinthedirec-tionofmaximalchangeandtheenhancementparameteriscom-putedasanon