Improving edge blending?
Edge blending works best when there are clean selections of Keep and Delete mask. If the wrong selections are made and there is some mask “bleed” over an edge then the algorithms become confused and blending goes wrong. Make sure your selections of Keep and Delete mask are free from contamination. Make small adjustments to Keep and Delete masks to improve blending and use methods to improve mask selections described in: “Why can’t my mask find an edge? – improving edge selections” Use the Test Render as you go to check the quality of your masking / blending.