怎么将一张图片的黑色背景去掉

C语言：怎么把下面这张图片上字体背后的黑色背景去掉，

123456789101112131415161718/*设置文本及背景色*/#includeconio。 h>main(){    void *buf;    clrscr();                                           /*清除字符屏幕*/    gotoxy(35,15);                                      /*光标定位到（35，15）*/    textcolor(YELLOW);                                  /*设置文本颜色为黄色*/    textbackg...全部

  123456789101112131415161718/*设置文本及背景色*/#includeconio。
  h>main(){    void *buf;    clrscr();                                           /*清除字符屏幕*/    gotoxy(35,15);                                      /*光标定位到（35，15）*/    textcolor(YELLOW);                                  /*设置文本颜色为黄色*/    textbackground(BLUE);                                   /*设置背景颜色为蓝色*/    cprintf("hello world ");                                  /*输出字符串hello world*/    cprintf("hello computer ");                               /*输出字符串hello computer*/    buf=(char *)malloc(2*11*2);                                /*buf指向分配的内存空间*/    gettext(35,15,60,16,buf);                               /*保存指定范围内的文本到内存中*/    puttext(20,5,45,6,buf);                                 /*将在内存中保存的文本输出*到指定位置*/    gotoxy(30,10);                                      /*光标定位到（30，10）*/    textattr(RED|128|GREEN*16);                         /*用textattr设置文本属性*/    cprintf("Moring");                                      /*输出字符串Morning*/  }。收起