Anchor anchor point understanding
Point(2,2) means that the source image is expanded by two pixels.
Point(1,1) means that the source image is expanded by 1 pixel.
Point(0,0) means that the source image is expanded by 0 pixels.
If it is a 5*5 matrix
Point(4,4), it means that the source image is expanded by 4 pixels
and expanded by 4 pixels.
