Color-difference　interpolation　(CDI)　has　been　a　widely　used　technique　for　various　color　demosaicking　methods.　CDI-based　methods　perform　interpolation　in　the　color-difference　domain　assuming　that　the　color-difference　signal　is　a　low-pass　signal.　Recently,　a　residual　interpolation　(RI)　algorithm,　which　conducts　interpolation　in　the　residual　domain,　has　been　developed,　and　it　assumes　that　the　residual　domain　is　flatter　or　smoother　than　the　channel-difference　domain.　In　this　paper,　we　comprehensively　show　a　frequency　domain　analysis　of　these　assumptions　and　observe　that　it　is　image　dependent　and　creates　artifacts　in　the　interpolated　image.　With　this　view,　we　propose　an　algorithm　that　uses　the　inter-color　correlation　as　well　as　the　residual　smoothness　among　the　different　channel　much　better　than　the　existing　algorithms.　Experimental　results　emphasize　that　the　proposed　algorithm　atribute　better　performances　the　existing　algorithms　in　terms　of　both　visual　and　objective　quality.　©　2019　IEEE.