将一张tga格式的图片读入内存,做一系列处理,分别保留红,绿,蓝分量,将rgb各分量做平均,相互交换,替换某一分量等操作,最后输出,与原图片比较-tga format will be a picture read into memory, so a series of treatment, respectively, retained the red, green and blue components, rgb components