PHP imgefilter参数值IMG_FILTER_SMOOTH问题

Question

I was wondering what does the following sentence mean in laymens terms about the value of the IMG_FILTER_SMOOTH parameter value.

At about 10, the picture is almost normal, because the original pixel values are given more weight than the combined sum of its neighbors.

Answer 1

bool imagefilter ( resource image, int filtertype [, int arg1 [, int arg2 [, int arg3]]] )

IMG_FILTER_SMOOTH: Makes the image smoother. Use arg1 to set the level of smoothness.

See the difference in live action http://www.css.kiev.ua/gd-filtry/