关于color set 的这段小程序是什么意思啊？谢啦

sub allocate_colors {
        foreach $value (0..$#red) {
                $color[$value] = $im->colorAllocate($red[$value],$blue[$value],$green[$value]);
        }
}


@red = (0,3,1,3,2,1,0,203,184,203,203,170,154,200,122,203);
@blue = (0,184,128,0,203,160,115,200,151,111,0,0,0,0,69,203);
@green = (0,186,196,196,2,1,0,2,0,0,0,0,0,203,160,203);

把RGB颜色..填入$im的属性中...

能不能在具体解释一下啊？谢拉~