ZedGraph是一个报表图形生成工具。可以生成折线、饼图、雷达图、柱状图等等n多图形-ZedGraph is a graphical report generation tool. Can generate a broken line, pie, radar chart, histogram, and so n multi-graphics

一段把ppm文件生成颜色直方图的c代码，生成结果为64位hist文件-Ppm files to generate a color histogram of the c code to generate the results for the 64-bit hist file

this code generate the histogram of a picture and normalize it .