How to smooth a bitmap file? We can search out the adjacent eights points of a point, and work out theaverge value of these nine points. It is essential to change the value of a point and make its value approximateits neighbors. In this way, edges in a picture can be smoothed.
On the contrary, what if we make a point value set out of its neighbors? It just is alike that a whitepoint at a black broad. It that way, we can sharpen a picture. Sharpening a picture we usually find somenoise points or lines in a picture at once.
A pixel or a point on the screen usually maps a block in a printer or other output device. The block iscalled as "pixel". A "pixel" includes many a point. By the way, a "pixel" is so tiny that we usually considerit as a point. A "pixel"'s gray degree is represented by number of its including black points. In other words,the gray degree of a "pixel" varies from the number of its black points.
