本文介绍了如何通过对位图文件中每个像素点及其周围八个相邻点的平均灰度值进行计算来实现图片的平滑处理。同时，文中也探讨了通过使某些像素点的值远离其邻居来达到锐化效果的方法。
How to smooth a bitmap file? We can search out the adjacent eights points of a point, and work out the
averge value of these nine points. It is essential to change the value of a point and make its value approximate
its 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 white
point at a black broad. It that way, we can sharpen a picture. Sharpening a picture we usually find some
noise 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 is
called as "pixel". A "pixel" includes many a point. By the way, a "pixel" is so tiny that we usually consider
it 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.
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