For further demonstration of the nodes visit my post

Morphological Operations that implemented with (diamond and square kernel) : Erode, Dilate, Closing and Opening operations can be processed on a binary image as if now. Might be updating with a round kernel. Erode/Dilate up to 32 Samples/Pixel. Supporting non-square textures.

Erode - Erode along your mask

Dilate - Dilate along your mask

Closing - Closing a shape

Opening - Opening a shape basically removing small noise around your shape