For example when a section of one image is moved to another anti aliasing can create.
What is matting in photoshop.
Matting is a menu item in the layer menu used to edit pixels on the fringe of an image or new layer.
Hit ok and let photoshop do its thing.
Photoshop tutorial defringe tool.
This video is available free for everyone.
Simply select the layer with the fringe on it and go layer matting defringe and typically i defringe between 1 3 pixels depending on how much fringe it there.
This photoshop tutorial video on how to use the defringe white matting and black matting tools.